Fix for qLineEdits everywhere
QLineEdit gives away to Qt's shortcut system
some key events (basically, everything with modiiers)
even if it could handle them and use for text editing,
when there is registered shortcut, matching this key input.
Example: pressing "ctrl+backspace" (used to delete word
left from cursor) in layer name editing field will cause filing canvas with background color, instead of deleting word left from cursor.
Differential Revision: https://phabricator.kde.org/D5265