Review Request 125863: Fix WheelScrollLines settings with Qt >= 5.5

[Luca Beltrame]

> On Ott. 30, 2015, 8:34 p.m., Luca Beltrame wrote:
> > It looks like this broke mouse wheel scrolling for me (on Qt 5.5.1): how can I debug to ensure this is the case and not a local issue?
> 
> David Rosca wrote:
>     Broke in what way? Did you try if it works without this commit?
> 
> Luca Beltrame wrote:
>     I just reverted it and wheel scrolls again.
>     Broken as in, there is no wheel scrolling in (tested):
>     
>     - Kate
>     - Konversation
>     - Kontact
>     
>     But works in:
>     - Dolphin
> 
> David Rosca wrote:
>     It shouldn't break it, unless you have set 0 wheel scroll lines in mouse kcm. In the worst case, it should just ignore that value from kcm and use default 3 lines (but that is what this should be actually fixing).
> 
> Luca Beltrame wrote:
>     FYI, it's set to 3 lines there.
> 
> David Rosca wrote:
>     Ok, so can you add qDebug() << "wheelscrolllines" << m_hints[QPlatformTheme::WheelScrollLines]; after it is fetched from config and check it picks the correct value? (line 110 and 337 in khintssettings.cpp)
>     Also can you test if changing the wheel scroll lines value in mouse kcm and applying it fixes scrolling for running applications?

Before adjusting config in the mouse KCM:
```
kate
wheelscrolllines at line 110  QVariant(int, 0)
0x13dda40 void QWindowPrivate::setTopLevelScreen(QScreen*, bool) ( QScreen(0x977880) ): Attempt to set a screen on a child window.
0x13ddf20 void QWindowPrivate::setTopLevelScreen(QScreen*, bool) ( QScreen(0x977880) ): Attempt to set a screen on a child window.
0x13de8b0 void QWindowPrivate::setTopLevelScreen(QScreen*, bool) ( QScreen(0x977880) ): Attempt to set a screen on a child window.
0x13df0a0 void QWindowPrivate::setTopLevelScreen(QScreen*, bool) ( QScreen(0x977880) ): Attempt to set a screen on a child window.
0x13e2150 void QWindowPrivate::setTopLevelScreen(QScreen*, bool) ( QScreen(0x977880) ): Attempt to set a screen on a child window.
0x145e790 void QWindowPrivate::setTopLevelScreen(QScreen*, bool) ( QScreen(0x977880) ): Attempt to set a screen on a child window.
wheelscrolllines at 338 QVariant(int, 0)
````

After changing config, scrolling works again (need an application restart).


- Luca


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On Ott. 29, 2015, 8:01 p.m., David Rosca wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/125863/
> -----------------------------------------------------------
> 
> (Updated Ott. 29, 2015, 8:01 p.m.)
> 
> 
> Review request for KDE Frameworks.
> 
> 
> Bugs: 291144
>     https://bugs.kde.org/show_bug.cgi?id=291144
> 
> 
> Repository: frameworkintegration
> 
> 
> Description
> -------
> 
> Use platform theme hint instead of manually using QApplication::setWheelScrollLines
> 
> 
> Diffs
> -----
> 
>   src/platformtheme/khintssettings.cpp 6e8313d 
> 
> Diff: https://git.reviewboard.kde.org/r/125863/diff/
> 
> 
> Testing
> -------
> 
> Qt 5.5 apps now correctly scroll by the value set in mouse kcm
> 
> 
> Thanks,
> 
> David Rosca
> 
>

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