Hi Scott,

Thanks for reproducing the problem.

I tried digging into example-Qt4Qt5 but I know nothing about Qt and frankly was turned off not being able to find a pre-built version of qmake (even after installing the Qt SDK). Are you able to publish a pre-built executable of example-Qt4Qt5 for me to try out?

Thanks,
Gili

On 2018-05-23 6:40 PM, Scott Bloom wrote:

To duplicate under windows 10:

 1. Setup two monitors, resolution doesn’t matter, however the Scale &
    layout option (windows 10), “Change the size of text, apps and
    other items” to 125% on one screen
 2. Run the example-Qt4Qt5 app as shipped with the QScintilla core
 3. In the screen with magnification, just type, you will see the
    visible cursor is NOT where it should be.

I have confirmed it doesn’t happen with SciTE

It doesn’t appear it has anything to do with moving, just having the window open on the scaled screen.

Gili, can you confirm that ?

Scott

*From:*cowwoc <[email protected]>
*Sent:* Wednesday, May 23, 2018 15:19
*To:* Scott Bloom <[email protected]>; Phil Thompson <[email protected]>
*Cc:* [email protected]
*Subject:* Re: [QScintilla] Bug report: Caret position is incorrect if window dragged across monitors

Thanks Scott. As far as I can tell, this bug isn't 4k specific.

If I change my 1080p monitor to have the same scaling factor as the 4k monitor and drag TortoiseHg across the problem does not occur. The bug seems tied to different scaling factors, regardless of the monitor resolution.

Gili

On 2018-05-23 6:17 PM, Scott Bloom wrote:

    I don’t have a 4k monitor, but I will try to play with it on a
    multimonitor PC and see if I can set the scaling factor on one
    screen and not the other (all three screens are the same
    resolution here)

    There is not (that I know of) a QScintialla public test app


    Scott

    *From:*cowwoc <[email protected]>
    <mailto:[email protected]>
    *Sent:* Wednesday, May 23, 2018 15:15
    *To:* Scott Bloom <[email protected]> <mailto:[email protected]>;
    Phil Thompson <[email protected]>
    <mailto:[email protected]>
    *Cc:* [email protected]
    <mailto:[email protected]>
    *Subject:* Re: [QScintilla] Bug report: Caret position is
    incorrect if window dragged across monitors

    It just tested SciTE and it works fine.

    Do you have an equivalent program that uses QScintilla?

    PS: Using TortoiseHg, if I keep the application on the same
    monitor and change its scaling factor the bug does not occur. The
    bug only seems to occur when the application is dragged from one
    monitor to another. My guess is that when the application is
    sitting on one monitor and the scaling factor is changed, it
    receives and responds to an event. But when the application is
    dragged across monitors it does not recieve a scaling-specific
    event and as such it doesn't think to update the DPI accordingly.
    I would be surprised if this logic was TortoiseHg-specific (it
    seems like something that should be handled by the lower layers)
    but who knows...

    Thanks,
    Gili

    On 2018-05-23 6:08 PM, Scott Bloom wrote:

        Understood.

        You may want to try SciTE.

        That is a base editor, tied to the core Scintilla widget, not
        used QScintilla (which is a Qt wrapper for the core)

        In reality, the TortoiseHg devs, need to work on this, to see
        if its their bug first..

        This could be due to the 4k to HD resolution swap…


        Scott

        *From:*cowwoc <[email protected]>
        <mailto:[email protected]>
        *Sent:* Wednesday, May 23, 2018 15:06
        *To:* Scott Bloom <[email protected]>
        <mailto:[email protected]>; Phil Thompson
        <[email protected]> <mailto:[email protected]>
        *Cc:* [email protected]
        <mailto:[email protected]>
        *Subject:* Re: [QScintilla] Bug report: Caret position is
        incorrect if window dragged across monitors

        Hi Scott,

        I'm not affiliated with TortoiseHg. I'm just an end-user. As
        such, I have no idea how to create a minimal testcase outside
        of TortoiseHg. When I filed a bug report at
        
https://bitbucket.org/tortoisehg/thg/issues/5086/caret-position-is-incorrect-if-window
        I attached a video demonstrating the problem. Hopefully
        that'll help.

        If you guys have a stand-alone application I could run, I can
        try reproducing the problem with it as well.

        Thanks,
        Gili

        On 2018-05-23 4:45 PM, Scott Bloom wrote:

            I have a PC with multiple monitors..

            However, looking at the issue, there is no minimal
            testcase. There is also nothing saying it’s a bug in
            Scintilla, QScintilla or tortoisehg.  It could be any of
            the three.

            Why is the assumption being made that its QScintilla?

            Scott

            *From:*QScintilla
            <[email protected]>
            <mailto:[email protected]> *On
            Behalf Of *cowwoc
            *Sent:* Wednesday, May 23, 2018 13:42
            *To:* Phil Thompson <[email protected]>
            <mailto:[email protected]>
            *Cc:* [email protected]
            <mailto:[email protected]>
            *Subject:* Re: [QScintilla] Bug report: Caret position is
            incorrect if window dragged across monitors

            On 2018-05-23 11:09 AM, Phil Thompson wrote:

                On 23 May 2018, at 3:01 pm, cowwoc<[email protected]> 
<mailto:[email protected]>  wrote:

                    On 2018-05-23 8:46 AM, Phil Thompson wrote:

                        On 22 May 2018, at 3:48 am, 
cowwoc<[email protected]>
                        <mailto:[email protected]>  wrote:

                            Sorry, I forgot to include the bug 
report:https://bitbucket.org/tortoisehg/thg/issues/5086/caret-position-is-incorrect-if-window

                            Thank you,

                            Gili

                            On 2018-05-21 9:13 PM, cowwoc wrote:

                                Hi,

                                Can someone please take a look at this bug 
report which seems to affect your project?

                        Sorry, I don't have the equipment needed to reproduce 
the problem.

                        Phil

                    Hi Phil,

                    Which equipment are you missing? A video card with 2 ports? 
2 monitors? Or a copy of Windows?

                ...and a PC.

                Phil

            Fortunately for you, that's not a problem :) Assuming you
            have a Mac laptop:

             1. Plug in a second monitor (any will do) so your laptop
                sees multiple monitors.
             2. Fire up a virtual machine of your choosing. I used
                VMWare Workstation, which is equivalent to VMWare
                Fusion on Mac. I believe VirtualBox (which is free)
                will work just as well.
             3. Download and install the Windows 10 ISO which you can
                download for free from
                https://www.microsoft.com/en-ca/software-download/windows10
             4. You can run Windows 10 without a license for a short
                period of time (30 days I believe) so this isn't a
                problem.
             5. Configure the VM with 2 virtual monitors and you
                should be able to reproduce the problem.
             6. I just tried it in VMWare Workstation and it worked
                for me.

            I haven't been able to get this working (yet) using a
            single physical monitor. See
            
https://superuser.com/questions/1325393/how-to-use-multiple-virtual-monitors-if-host-has-a-single-monitor

            But it's possible that VirtualBox is better in this regard
            than VMWare Workstation.

            Gili


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