QLineEdit: fix the shortcut override events on a readonly line edit

When a QLineEdit is readonly there's a discrepancy between key press
events and shortcut override events. For instance, presses Ctrl+C
copies the text unless there's also a shortcut for the same key sequence.
In this case, the shortcut override event is not handled, and no text
is copied. Fix it by splitting the handling of shortcut override
events between "read only" access (copy, select, etc.), which still
makes sense on a read only line edit, and write access (paste, ...)
which doesn't.

[ChangeLog][Important Behavior Changes][QLineEdit] QLineEdit will
now accept certain shortcut override events even if it is read only.

Change-Id: Ie5b048259b99a1eff0581129e3ad97f27a88fe86
Task-number: QTBUG-21217
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>

0 files changed, 0 insertions, 0 deletions