DEBUG kbd mapping: umlauts slip through when hit while editable table cell is focused

[ronso0]

This adds some logging in order to debug
Keyboard shortcut “ö” stopped working (other umlauts affected, too)

Symptoms:

In the tracks view, certain special characters (äöüß) don't trigger the controls set in the kbd mapping if the focus is on editable cells. keyboardSearch() is called instead.

I don't understand how these keys can slip through KeyboardEventFilter::eventFilter.
IIUC QKeyEvents are processed like this:

1. KeyboardEventFilter::eventFilter
   • checks if it's not modifier-only and if there is a mapping for the key
   • if yes: key event is consumed, control is triggered
2. else WTrackTableView::keyPressEvent() is called
   • if it's a special key handled by us, respective function is called and returns
   • else QTableView::keyPressEvent() is called which might call
3. QAbstractItemView::keyboardSearch(text) if the QKeyEvent::text() is not empty

Qt 5.15.13
keyboard layout