https://bugs.kde.org/show_bug.cgi?id=365050
Bug ID: 365050
Summary: KToolBar constant repaint when a QToolButton is added
in it
Product: frameworks-kxmlgui
Version: 5.23.0
Platform: Ubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: kdelibs-b...@kde.org
Reporter: j...@kdenlive.org
While investigating a major CPU usage in Kdenlive, I could trace it to
KToolBar.
Adding a QToolButton in a KToolBar causes a constant repaint of the toolbutton
with a big CPU consumption (1-2% for just one toolbutton). The same code with a
QToolBar works correctly.
Reproducible: Always
Steps to Reproduce:
This sample code can reproduce the issue:
QToolButton *button = new QToolButton();
QAction *ac = new QAction(QString("test"), this);
button->setDefaultAction(ac);
KToolBar *tb = new KToolBar(this);
addToolBar(tb);
ktb->addWidget(button);
Actual Results:
You can visualize the problem using KWin's "Show Paint" Desktop Effect which
shows the toolbutton is contantly repainted, and CPU usage also goes up (1-2%
on my Core i7) whenever the app window is active.
Expected Results:
No useless repaint / CPU waste. Replacing KToolBar with QToolBar fixes the
problem.
Also tested against latest 5.24 Frameworks
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