[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Christoph Cullmann via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

Christoph Cullmann  changed:

   What|Removed |Added

 CC||cullm...@kde.org
 Status|CONFIRMED   |RESOLVED
 Resolution|--- |MOVED

--- Comment #11 from Christoph Cullmann  ---
I think the Qt Bugtracker is ok for that, I close this as moved, please comment
there, as it needs to be fixed in Qt.

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Buovjaga via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

Buovjaga  changed:

   What|Removed |Added

 CC||todven...@suomi24.fi
 Ever confirmed|0   |1
 Status|UNCONFIRMED |CONFIRMED
   See Also||https://bugreports.qt.io/br
   ||owse/QTBUG-49294

--- Comment #10 from Buovjaga  ---
Status should obviously be confirmed by now, so changing. What would be a
better product for this?

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Tsu Jan via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

--- Comment #9 from Tsu Jan  ---
I'm almost sure that this bug is about
https://bugreports.qt.io/browse/QTBUG-49294

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Aurelijus via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

Aurelijus  changed:

   What|Removed |Added

 CC||ody...@gmail.com

--- Comment #8 from Aurelijus  ---
Still around on Kubuntu 16.04 with backported KDE 5.6 (same was true with 5.5).

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Christian via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

Christian  changed:

   What|Removed |Added

 CC||christian.fr...@gmail.com

--- Comment #7 from Christian  ---
I'm observing a similar behaviour. I have to mention that I'm running Ubuntu in
VirtualBox. However my problem does not appear in any other application like
for example Firefox.

Scrolling with the mouse wheel is very laggy/jumpy and only works at all if the
mouse is not moved at all. No such problem can be observed when using the
touchpad.

Same problem in KWrite by the way and similar but less severe also in gedit but
not at all (everything 100% smooth, no matter how hard you shake the mouse) in
Firefox.

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Bob Wya via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

Bob Wya  changed:

   What|Removed |Added

 CC||bob.mt@gmail.com

--- Comment #6 from Bob Wya  ---
Unlike KDE-4 I've got to remember to give Qt 5 applications explicit mouse
focus before scrolling in them...

I don't see what's hard about reproducing this Qt 5 bug... It occurs every time
that I mouse over a scrollable region, in a Qt 5 application, and I don't give
that Window explicit focus (by giving it a LHS mouse button event)!! It's
really annoying... :-(

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

andreas.sturmlech...@gmail.com changed:

   What|Removed |Added

 CC||andreas.sturmlechner@gmail.
   ||com

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Tsu Jan via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

--- Comment #5 from Tsu Jan  ---
I forgot to confirm what Denis said: this is a Qt5 bug and not specific to Kate
or KDE. However, it is specific to Linux.

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Tsu Jan via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

Tsu Jan  changed:

   What|Removed |Added

 CC||tsujan2...@gmail.com

--- Comment #4 from Tsu Jan  ---
I encountered this erratic and annoying behavior since Qt-5.3. In
https://bugreports.qt.io/browse/QTBUG-38274, they say it's fixed but it isn't.
As far as I know, the problem is in the first QWheelEvent after the enter
event.

I think a clean Qt bug report is needed. Otherwise, it might not be fixed soon.

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Denis Akimkin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

--- Comment #3 from Denis Akimkin  ---
The problem seems to be not only Kate-specific. For example, I was able to
reproduce that in Dolphin when scrolling through a dir with a lot of entries.

There's a Qt5 bug (https://bugreports.qt.io/browse/QTBUG-46461) describing
somewhat similar behaviour, but I'm not sure whether it's really related to
this bug. The test case from Qt bug seems to produce wrong angle delta
regardless to whether window is in focus or not.

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[kate] [Bug 354482] scrolling quickly with the mouse wheel jumps and can even scroll backwards

[Denis Akimkin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354482

Denis Akimkin  changed:

   What|Removed |Added

 CC||akimkin.de...@gmail.com

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