Improved tab bar scrolling

[Servall4]

Remove custom wheelEvent handler. Default QAbstractScrollArea wheel handler seems to work better on platforms like MacOS.

Before:

ads_impl-Untitled.MPEG-4.mp4

due to hardcoded step value, it is very difficult to scroll to the desired tab

After:

qt_impl-Untitled.MPEG-4.mp4

[githubuser0xFFFF]

Thank you for your pull request. If I merge the request,, then scrolling the tabs via mouse wheel does not work anymore on Windows with Qt 6.5.2.

[githubuser0xFFFF]

I just pushed a branch improved_tabbar_scroll with improved wheelEvent function. Please test, if this improves scrolling on Mac for you.

[Servall4]

Yes, scrolling has become much smoother on the touchpad, but it now works on the Y axis, which is unusual for a touchpad.

[Servall4]

Apparently, the Qt implementation does not assume scrolling of the horizontal scrollbar along the Y axis, this is why scrolling didn't work for you. So we can cheat and send this wheelEvent directly to horizontal scrollbar with this code in CDockAreaTabBar::wheelEvent():
QCoreApplication::sendEvent(horizontalScrollBar(), Event);
Similar logic is implemented in the Qt source code.
Can you test updated code, please?

[githubuser0xFFFF]

The code works now. I will merge your pull request. Thank you.