Fix high CPU utilization caused by key repeat timer

Key repeat timer has been broken since the beginning.

The key repeat timer leaked timer instances while processing the event,
causing the accumulation of unprocessed timer events and high CPU
utilization.

Fix the issue by killing the original timer (long press delay 600 ms)
and starting the key repeat timer (repeat delay 50 ms) once.

[ChangeLog] Fixed high CPU utilization caused by key repeat timer.

Fixes: QTBUG-94259
Change-Id: Iff47249db27cda3750f497cb02c1cb642261e032
Reviewed-by: Jarkko Koivikko <jarkko.koivikko@code-q.fi>
(cherry picked from commit 63a944ff12580f2c333a162ecaecd12419a39c10)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/virtualkeyboard/qvirtualkeyboardinputengine.cpp b/src/virtualkeyboard/qvirtualkeyboardinputengine.cpp
index c1675507..54b356b3 100644
--- a/src/virtualkeyboard/qvirtualkeyboardinputengine.cpp
+++ b/src/virtualkeyboard/qvirtualkeyboardinputengine.cpp
@@ -713,9 +713,11 @@ void QVirtualKeyboardInputEngine::timerEvent(QTimerEvent *timerEvent)
 {
     Q_D(QVirtualKeyboardInputEngine);
     if (timerEvent->timerId() == d->repeatTimer) {
-        d->repeatTimer = 0;
         d->virtualKeyClick(d->activeKey, d->activeKeyText, d->activeKeyModifiers, true);
-        d->repeatTimer = startTimer(50);
+        if (!d->repeatCount) {
+            killTimer(d->repeatTimer);
+            d->repeatTimer = startTimer(50);
+        }
         d->repeatCount++;
     }
 }