https://bugs.kde.org/show_bug.cgi?id=395034
Bug ID: 395034
Summary: QMenu becomes invisible when cleared while still open
Product: kwin
Version: 5.12.5
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: farid.boude...@gmail.com
Target Milestone: ---
Created attachment 113078
--> https://bugs.kde.org/attachment.cgi?id=113078&action=edit
QMenu cleared by a timer with compositing enabled
When an open QMenu is cleared through a function triggered by a signal (e.g.
QTimer or a queued connection) it becomes invisible but its actions are
working.
The bug can be replicated using the following Qt app:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QToolButton *button = new QToolButton(ui->mainToolBar);
QMenu* menu = new QMenu(button);
button->setText("Menu");
button->setMenu(menu);
button->setPopupMode(QToolButton::InstantPopup);
QTimer* timer = new QTimer(this);
connect(timer, &QTimer::timeout, this, [=](){
menu->clear();
menu->addAction("Menu 1");
menu->addAction("Menu 2");
menu->addAction("Menu 3");
});
timer->start(1000);
ui->mainToolBar->addWidget(button);
}
- The menu should be cleared and populated every second but it appears and
disappears. (See attachment)
- When compositing is disable it works as expected and does not disappear. (See
attachment)
- Although the menu is invisible it still works. (See attachment)
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