Gui: Fix black tooltip

[wwmayer]

The QTreeView of the preferences dialog has a transparent background and this somehow causes the tooltips to have black background with black text so that it's not readable.

Overriding the helpEvent() of the delegate class and handling the tooltip slightly different fixes the problem. All what's needed is to not pass the view as 3rd argument

[kadet1090]

@wwmayer I fixed the same issue just rearranging styles in the .ui file by targeting exact controls instead of setting stylesheet on them: #13663. For me this seems as less hacky solution.

According to the docs it should not behave this way, but for some reason it does: https://doc.qt.io/qt-6/stylesheet-syntax.html#cascading

[wwmayer]

Thanks. I have tried your changes and it fixes the tooltips. However, now I get this warning in the output window:
Could not parse stylesheet of object Gui::Dialog::DlgPreferencesImp(0x7fff41443f98, name = "Gui__Dialog__DlgPreferences")

[kadet1090]

That is strange, especially that the stylesheet is applied correctly. It was the stray ; at the end of stylesheet - I'll fixup mine PR to get rid of it.

[wwmayer]

Yes, it was the semicolon at the wrong position. Now it works correctly.

[chennes]

Is this PR superseded by #13663?

[kadet1090]

Imho yes, this can cause other side effects as it detaches tooltip rendering from the usual pipeline.

[wwmayer]

Superseded by #13663