Under Wayland Qt does not correctly handle key modifiers during key repeating

When you are using an X11 session and, for example, use the left/right arrow keys to move the cursor around the text, you can press the arrow key and periodically press the control modifier to change the cursor jump strategy from character-by-character to word-by-word. The sequence of pressing the keys doesn't matter; you just press control when needed to switch to the word-by-word style.

On Wayland, control needs to be pressed first, and it also doesn't allow modification during arrow key presses.

According to KDE guys, it is a failure in key-repeating code that does not take into account modifiers that were pressed after the repeat was started.

https://bugs.kde.org/show_bug.cgi?id=482401