Re: [Interest] Behavior of write() to stdErr in Qt Creator

Ok, I see. That is plausible. I will create an issue. Thanks for your support. On Fr, 2023-04-28 at 16:21 -0700, Thiago Macieira wrote: > On Friday, 28 April 2023 01:31:39 PDT Bernhard Lindner wrote: > > Please note that lines are not interleaved. Still a line feed is added after >

[Interest] Behavior of write() to stdErr in Qt Creator

g build from Qt Creator under gdb supervision. However when manually stepping through the code or when running the debug build without debugger the output looks just fine. I'm running the code on Kubuntu 20.04 and GCC 12. What is going on? -- Best Regards, Bernhard Lindner _

Re: [Interest] Official linuxdeployqt ?

AppImages are a breeze. For both developer and user. An easy to use Qt-provided tool for that purpose would be fantastic. On Mo, 2022-08-08 at 18:03 -1200, Vadim Peretokin via Interest wrote: > Just to correct some biases here, in my opinion as a software publisher > AppImage is > still the

Re: [Interest] Is there a good alternative to the QML Controls in Qt6 for native desktop integration purposes?

one way. Recently in one of the biggest german IT news portals there was a news about Qt. It got exactly one comment thread that said "After the new licensing model, Qt is dead anyway". If this is the conventional wisdom among OSS developers, then no further effort is needed

Re: [Interest] Is there a good alternative to the QML Controls in Qt6 for native desktop integration purposes?

development a > lot. But given > the crap that QML Controls is makes me consider switching to QWidgets instead. > > > Best regards, > Mark > ___ > Interest mailing list > Interest@qt-project.org > https://li

Re: [Interest] Ashamed bug :)

er has higher quality requirements than Qt provides and does not want to contribute, maybe he should consider if he is using the proper framework for his project(s). -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org

Re: [Interest] Ashamed bug :)

> The entire process is either difficult or easy. No. Actually it can be both: Difficult for an outsider and easy for a experienced Qt developer. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists

Re: [Interest] Ashamed bug :)

> We’re all looking forward to your contribution! > > https://wiki.qt.io/Qt_Contribution_Guidelines Once upon a time finding, analyzing and reporting bugs was considered a contribution as well. -- Best Regards, Bernhard Lindner ___ Interes

Re: [Interest] List traffic disappearing?

for some other reason? > > Sean > > ___ > Interest mailing list > Interest@qt-project.org > https://lists.qt-project.org/listinfo/interest -- Best Regards, Bernhard Lindner ___ Int

Re: [Interest] Learning solutions survey

Never heard about that license. I was very interested until I read the FAQ: "Under the educational license, limitations apply. Applications and/or devices may not be distributed to third parties and must be used for internal use only. Subcontracting in any direction is not allowed under this

Re: [Interest] Another Qt disappointment

> I don't know how they can sleep at night. I guess Uncle Scrooge would argue that you can sleep very good on a mattress stuffed with banknotes, no matter where the money came from ;-D I agree to all of your statements. -- Best Regards, Bernhard Lind

Re: [Interest] L Word

't understand Rolands style of speech I also can't understand people fighting back in the same style and then complaining about Roland. This is a mailing list. People can be filtered and/or ignored on an individual basis. -- Best Regards, Bernhard Lindner __

Re: [Interest] L Word

something I like and that can be very useful. Of course the underlying intentions must be constructive anyway - which should be the main question when considering to ban someone. Do you think Roland's main intentions are destructive? -- Best Regards, Bernhar

Re: [Interest] L Word

icts going? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Guide me through the Qt offerings for GUIs

explanation is, Qt kind of gave up desktop. You explained why the widgets concept is not compatible with the Quick concept. Can you also explain why it was not possible to implement Quick as an additional, mostly widget- independent C++ layer and then wrap it declaratively? -- Best R

Re: [Interest] Guide me through the Qt offerings for GUIs

dest puzzles! I ask myself this question every time I read the three letters "QML" :-) -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Guide me through the Qt offerings for GUIs

> Judging from the influx in the CopperSpice world, a lot of companies with > projects large > and small are biting the bullet. How did you come to this result? Are there any hard numbers, links, reports, etc. that you can share? -- Best Regards, Bernhar

Re: [Interest] Guide me through the Qt offerings for GUIs

inuously :( -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] the path forward - that 7 year thing - was, , willy-nilly

ing > on, that is __exactly__ what it looks like from the outside. So true! -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] the path forward - that 7 year thing - was, , willy-nilly

ould be giving the technology to people who don't ruin it with greed. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] The willy-nilly deletion of convenience, methods

> I don't know about other parts of the world, but in the U.S.A. the FDA > is very adamant. Only the binary set that they have tested gets installed. Pretty much the same in Germany. Also for other safety related (non-medical) industries. -- Best Regards, Bernhard L

Re: [Interest] The willy-nilly deletion of convenience, methods

my bugs reported via the forum are fixed within a couple of > days. Seriously? Wow. What kind of bugs? What impact? > Phones only care about what is shipping next week. > As I said before, those are diametrically opposed markets. I agree? > Just my 0.0002 cents. How do to change tha

Re: [Interest] The willy-nilly deletion of convenience, methods (was: Mixing Commercial and Open...)

Hi Roland, has any framework crossed your way that implements CoW? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] The willy-nilly deletion of convenience methods (was: Mixing Commercial and Open...)

sing KDE :( -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] The willy-nilly deletion of convenience methods (was: Mixing Commercial and Open...)

decisions, I can't imagine that people would ever trust them again. This could cause fatal damage to Qt in the long run if they don't sell it to someone more responsible. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.

[Interest] QCoreApplication, argc parameter type

type in the derived class' constructor parameter. So I guess there must be a very good reason why QCoreApplication uses a reference instead of copy-by-value. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https

Re: [Interest] Qt Designer zombie widget phenomenon

ayout is now "visible" and the object contained in that area appears. > > Being quite busy and seeing there were no need for layouts in these > dialogs anyway (it was fixed size having no max/min buttons) I nuked > every layout. One did need the min/max buttons. I recreated the .ui from

[Interest] Qt Designer zombie widget phenomenon

d the most recent Qt Creator with Qt 5.14.2. Has this happend to someone else before? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Three-file modules vs. moc

terest/plans in making it smarter, I will drop the original idea. Currently I would like to prefer to drop moc ;) -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Three-file modules vs. moc

arter than qmake? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Three-file modules vs. moc

on developers. Do you see a chance to fix the problem using the new tool set? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Three-file modules vs. moc

uot; using some simple regular expression which does not take any conditional compilation into account. Is this correct? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Three-file modules vs. moc

recommendation? It seems to me that such includes are only useful in special cases like mine and like .cpp files containing moc relevant code. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Three-file modules vs. moc

evel a mutual dependency lock can happen (similar to what you get if normal hpp/cpp modules try to include include eachother without using forward declarations). Only the two-level-inclusion as described above reliably solves all mutual inclusion issues. --

Re: [Interest] Three-file modules vs. moc

hat still invokes moc, > but for each foo.h also tells moc to include foo.inl, bar.h -> bar.inl, > and so on... Hm, I see. Has something like that been done before, is there code I could reuse? -- Best Regards, Bernhard Lindner #include "spinbox.inl" SpinBoxU64::SpinBoxU6

Re: [Interest] Three-file modules vs. moc

ent name. When adding an -f option for each of them, each moc_*.cpp file would include all *.inl includes... which would increase compile time exponentially. I would like to avoid that. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

[Interest] Three-file modules vs. moc

module.inl instead of (or along with) module.inl in moc_module.cpp? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] List on moderation

t Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Roland Qml

and knows what he is talking about. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

[Interest] Reason for omitted stream syntax of qFatal

Hi! Can someone tell me why exactly qFatal does not provide the stream syntax that was implemented for qDebug and friends? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo

[Interest] QDateTime::toString() fails when used in exit handler

UTC time, `b` is " GMT". I am not aware of any related restrictions of exit-handlers. Can someone tell me what is going wrong here? -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.or

[Interest] Connecting signal handler to Qt application - async-handler-safety

that. Are there any functions in Qt that are considered async-handler-safe? I'm especially looking for a way to send a (queued) signal. Other portable ways to wake the application from the event loop would be fine as well. -- Best Regards, Bernhard Lindner

Re: [Interest] CONFIG c++2a vs. QMAKE_CXXFLAGS += -std=c++2a

> > > > I expected both to have the same effect but there must be a difference since > > the latter gives me compilation errors while the first does not. > > The latter is equivalent to: > > CONFIG += c++2a strict_c++ -- Best Regards, Bernhard Lindner _

[Interest] CONFIG c++2a vs. QMAKE_CXXFLAGS += -std=c++2a

the first does not. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] QVariant compare operator

want. Including defining bugs and features :-) -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] QVariant compare operator

n qFatal. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] QVariant compare operator

documention during requirements phase was missed it should at least be documented now. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] QVariant compare operator

- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] QVariant compare operator

't convert, behavior should be undefined and qFatal() should be called (or whatever Qt 5.15 prefers to do in detectable cases of undefined behavior). -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] QVariant compare operator

Hi! > Relational comparisons with QVariant are deprecated in 5.15 and will be > removed because they are a misfeaure. > Redesign your code so your question does not need to be asked. Could you please explain why comparing two QVariants is a misfeature? -- Best Regards, Bernhar

Re: [Interest] Qt Creator licensing for companies with Qt Commercial developers

riorities in the Qt project have not been in line with my priorities for a few years) . -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Qt Creator licensing for companies with Qt Commercial developers

f a company, such generalized blames are a cardinal error. If you think a certain person uses inadequate words, criticize directly. > That said, I hope there are at least some recipients in the mailing list who > consider > this discussion valuable. Unless there is any new actual question, thi

Re: [Interest] Qt Creator licensing for companies with Qt Commercial developers

ne whether you can fulfill all of the obligations of applicable open source licenses". -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Handling XML Schemas in Qt without QXmlSchemaValidator

f Qt: > > Qt Script > > Qt Quick Controls 1 > > Qt XmlPatterns -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Handling XML Schemas in Qt without QXmlSchemaValidator

on. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Handling XML Schemas in Qt without QXmlSchemaValidator

XmlPatterns module deprected? Is that written somewhere? Qt XML Patterns main page doesn't mentioned that. That one would hit me hard as well should it ever be removed. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt

Re: [Interest] Handling XML Schemas in Qt without QXmlSchemaValidator

important use cases. Removing them (without an equal replacement) would destroy a lot of applications. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] QFile/QDir: force move mode only?

> QFile::rename should rename always or fail! It should never do > completely different operation - copy! I agree. -- Best Regards, Bernhard ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Operator QMap[] is casting to int?

> You were asking when static_casts between int and size_t are needed. > Interfacing Qt-based code with Standard Library types is one of such cases. Yes, and it is a nightmare. But this has been discussed in a different thread before. -- Best Regards, Bernhard L

Re: [Interest] Operator QMap[] is casting to int?

language)... until it was too late. -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Issue with QSqlModel and QSortFilterModel

o wrap up my own filter proxy > that has > multiple filter fields. For large(-ish) datasets the multiple model index > remappings eat > a lot of time and memory. > > I hope that helps you a bit > > Kind regards, > Konstantin. > ___

[Interest] Save and restore a Qt5 QWindow

is an effort I would really like to avoid)? -- Best Regards Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] clang-tidy version in Qt Creator

Am Dienstag, den 05.02.2019, 20:33 +0200 schrieb Nikos Chantziaras: > That's for running the checks live in the code model. For a static > analysis run (when selecting "Clang-Tidy and Clazy..." in the "Analyze" > menu) performance is not important, and it should be possible to use the > system

Re: [Interest] Individual static analysis warning suppression in Qt Creator

Hi! > This is https://bugreports.qt.io/browse/QTCREATORBUG-20201 Again, thanks a lot for your help! Such a significant defect... still it isn't even evaluated :-( -- Best Regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.

Re: [Interest] clang-tidy version in Qt Creator

e information! What version does Qt Creator use? Would it help to create an issue asking for an update? -- Best Regards, Bernhard Lindner signature.asc Description: This is a digitally signed message part ___ Interest mailing list Interest@qt-p

[Interest] Individual static analysis warning suppression in Qt Creator

-tidy/#suppressing-undesired-diagnostics) for a few warnings of different warning types but the comments have no effect. Has someone used those kind of suppression comments successfully in Qt Creator? Are they supposed to work? -- Best Regards, Bernhard Lindner

[Interest] clang-tidy version in Qt Creator

", "clang- tidy-9" executables. But I could not find a way to select the desired executable in Qt Creator. -- Best regards, Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Qt Creator, Clang Code Model, supplying specific GCC symbols

> > What is the best/designated way to supply relacement macros for those > > symbols so the clang analysis succeeds? Is there some configuration/setting > > in Qt Creator? Should I patch the code? Should I pass this to clang as > > command line arguments? > > You should contribute the

Re: [Interest] Qt Creator, Clang Code Model, supplying specific GCC symbols

Sorry for asking again... I have not found a solution yet. I tried to define the macros using #ifdef __clang__ / #endif but it seems __clang__ is not defined during code model parser run. Also all GCC smybols are defined so I can not disinguish clang from GCC. I also tried to add a -D argument

[Interest] Qt Creator, Clang Code Model, supplying specific GCC symbols

the code? Should I pass this to clang as command line arguments? -- Best Regards Bernhard Lindner ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest

Re: [Interest] Qt Creator vs inline headers

> > I can fix that in the MIME settings but it seems to make no sense. > > > > Why is Qt Creator configured that way? > > Because the MIME type says it's source, not header. Yes. But that doesn't make sense. An .inl file is a header. It contains inline code and especially template

[Interest] Qt Creator vs inline headers

Hi! *.inl files are usually used as cascaded headers containing template and inline definitions. Qt Creator handles such files as source files (similar to *.cpp) instead of header files(similar to *.hpp). I can fix that in the MIME settings but it seems to make no sense. Why is Qt Creator

[Interest] QTableView behavior; word wrapping plus rows resize to content

Hi! I am using a QTableView with word wrapping enabled and rows configured to resize to content automatically. Is it desired behavior that the view a does NOT update the row height when columns are manually resized in a way that a cell changes from single-line to double-line text (or vice

Re: [Interest] Porting Qt to our RTOS

e yourself if this a reasonable and/or desired effect of your way of handling issues or not. I miss Qt 4.0.0 times a lot. It was fun back then. -- Best Regards Bernhard Lindner ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.o

[Interest] “Qt Embedded” fonts in Qt Creator

Hi! When selecting a font for a widget in Qt Creator 4.6.2, some of the fonts have a postfix [Qt embedded] in their name. E.g. "DejaVu Sans Mono [Qt Embedded]". What does [Qt Embedded] mean exactly? -- Best Rergards, Bernhard ___ Interest mailing

Re: [Interest] Qt cross plattform installer, offline configuration

Hi! > How do you want to "remove the application" without any type of > application? In its simplest format, that is what the maintenance > tool does. You can also call in "uninstall" if that is all you want > it to do. Well, the installer itself should provide the function for

[Interest] Qt cross plattform installer, offline configuration

Hi! I am currently reviewing different ways of creating cross plattform installers for Qt applications (Windows and Linux mainly). The installers shall work in a classical way, i.e. they shall: 1. work completely offline 2. install no maintenance tool 3. support installing and removing the

[Interest] selectionChanged on remove

eActions(), done by the application, fixes that problem but I wonder why it is necessary. In my application I have the same behavior except that I totally rely on the seletionChanged() signal... which is why my application crashes. Is that actually desired behavior? -- Best Regards Bernhard Lindner

Re: [Interest] QTextStream vs UTF-8 string literals

> > http://stackoverflow.com/q/40318671/1421332 > > > > It asks why operator<<(const char *string) expects latin-1 strings > > (especially considering that Qt source files shall be UTF-8 now). > > > > Is that desired behavior? > > No. It's something I didn't notice when I changed the encoding

[Interest] QTextStream vs UTF-8 string literals

Please note this questions in StackExchange: http://stackoverflow.com/q/40318671/1421332 It asks why operator<<(const char *string) expects latin-1 strings (especially considering that Qt source files shall be UTF-8 now). Is that desired behavior? Is there an easy way to stream a lot of UTF-8

Re: [Interest] What don't you like about Qt?

1. New features (quantity) are priorized over bug fixing (quality). Suggestions are almost sensless. I reduced writing bug reports and totally gave up writing suggestions due to this. 2. Widgets have too low priority. In general new fancy features are priorized above bread-and-butter features

Re: [Interest] Sending mail with line breaks using QDesktopServices::openUrl

> Please try xdg-open on the command-line with that URL. My guess is that it > will fail too, in which case it's not Qt's fault. It fails in the same way: Body set but no line break. I also tried KMail directly: Body set but no line break. So it is probably a problem of KMail. I am using version

Re: [Interest] Sending mail with line breaks using QDesktopServices::openUrl

> this opened kmail with the recipient, subject and body being set > correctly (with line break) Which KMail version? -- Regards, Bernhard Lindner signature.asc Description: This is a digitally signed message part. ___ Interest mailing list In

Re: [Interest] Sending mail with line breaks using QDesktopServices::openUrl

> I can't confirm that it works. I tried on the command-line with xdg-open and > by directly clicking the link above in KMail. Neither time was the body > present at all. When using the link in the mail, it doesn't work for me too. When clicking the same link in a local html file it works. Very

[Interest] Sending mail with line breaks using QDesktopServices::openUrl

em? -- Best Regards Bernhard Lindner signature.asc Description: This is a digitally signed message part. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest

Re: [Interest] Design Issue with QAbstractItemModel & QTreeView

I have seen that problem before: http://stackoverflow.com/q/36412671/1421332 Unfortunately no answer there too. > I'm not sure what are you talking about. But what about > beginInsertRows() and endInsertRows()? Between this methods you should > add new data, and this data can has child rows. >

Re: [Interest] Qt ownership model

> > All those class names and function names with capital letters don't line > > up with the standard library, so the argument is not accepted. > > And that's why I /love/ Qt so much and would choose it anytime again over an > API that_looks &*like_this(); +1 -- Regards, Bernhard

Re: [Interest] Local version control with Qt Creator on Linux

> You shouldn't need to do a p4 checkout for building. If you have to do that, > then you checked files in that you shouldn't have added. Thanks for all of the kind answers. Git obviously is the consensus :-) I installed git and I can see the "Git" pull-down menu in Qt Creator. I selected the

[Interest] Local version control with Qt Creator on Linux

Hi! I am experimenting with Qt5 + Qt Creator on Linux Kubuntu. I would like to try using the version management integration of Qt Creator. I don't want to use a public server so I need to setup something local. I am not an expert in Linux administration... setting up the server side and

Re: [Interest] Using QDBusConnection::sessionBus()

> Bus is the connection valid? Is it connected? Yes. > From what I can tell here, you're doing nothing wrong. The bug is in > systemd. Well... that's a pitty. So I will try to achive the same using QProcess command line invocations. I should probably report that in some way. Is it a (K)Ubuntu

Re: [Interest] Using QDBusConnection::sessionBus()

Thanks Thiago that you actually responded to that confusing question. I was exhausted and didn't add the most important information. Let me try again after getting some sleep: I intended to use QDBusConnection::sessionBus() (Kubuntu 15.10 running Qt5.4.2) to access the systemd user session bus