[Development] High CPU with QToolBar win32

[Tres Finocchiaro]

Hi,

Are there any known issues with QToolBar Qt5 win32?

We've (LMMS) a downstream bug and I'm trying to isolate the cause.

https://github.com/LMMS/lmms/issues/2767


   - It only happens with Qt5
   - It only happens with QToolBar
      - We have the QToolBar in a QMdiSubwindow/QWidget, not the main
      window.
   - It's not reproducible with QtCreator, at least when using the default
   UI creator and the main window's toolbar.
   - We use a win32 build of Qt5 from a self-maintained PPA, so if a
   particular issue was addressed upstream we may not have it yet, but I
   couldn't find a particular bug that mentioned this.

Disclaimer, slight amateur debugging these things. :)

-Tres


- Tres.Finocchiaro at gmail.com
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