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widgets: Don't report new focus object during clearFocus() unless needed

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We do not unconditionally clear focus_child like the existing comment
said. We only do it if the focus_child was the widget that is clearing
focus. So in many cases we'll end up with the same focus object as
before. We can not report that as a focusObjectChanged to the window,
as that will potentially trigger a reset or cancel of the current
input method for the (unchanged) focus object.

Fixes: QTBUG-86976
Change-Id: I54367e46eda7a94d967f58960bd926c195dc09cc
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 7d5ba1c17ecbb620731ff7322fd278c3ce496dad)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Tor Arne Vestbø 2020-11-18 13:21:05 +01:00 committed by Qt Cherry-pick Bot
parent c5d904639d
commit a778580339
1 changed files with 7 additions and 6 deletions
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13
src/widgets/kernel/qwidget.cpp
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@ -6715,6 +6715,9 @@ void QWidget::clearFocus()
QApplication::sendEvent(this, &focusAboutToChange);
}
QTLWExtra *extra = window()->d_func()->maybeTopData();
QObject *originalFocusObject = (extra && extra->window) ? extra->window->focusObject() : nullptr;
QWidget *w = this;
while (w) {
// Just like setFocus(), we update (clear) the focus_child of our parents
@ -6723,14 +6726,12 @@ void QWidget::clearFocus()
w = w->parentWidget();
}
// Since we've unconditionally cleared the focus_child of our parents, we need
// We've potentially cleared the focus_child of our parents, so we need
// to report this to the rest of Qt. Note that the focus_child is not the same
// thing as the application's focusWidget, which is why this piece of code is
// not inside the hasFocus() block below.
if (QTLWExtra *extra = window()->d_func()->maybeTopData()) {
if (extra->window)
emit extra->window->focusObjectChanged(extra->window->focusObject());
}
// not inside a hasFocus() block.
if (originalFocusObject && originalFocusObject != extra->window->focusObject())
emit extra->window->focusObjectChanged(extra->window->focusObject());
#if QT_CONFIG(graphicsview)
QWExtra *topData = d_func()->extra;