Amends 17c1ebf8bf, after which dragEnabled
item views toggled selection on click rather than on press. If the edit
trigger included SelectedClicked at the same time, then Ctrl-Clicking a
selected item would start editing the item, instead of toggling
selection.
Fix this by ignoring clicks with modifier when evaluating whether
editing should start.
Extend the mouseSelection test case by including a column for the
editTrigger, and cover the respective combinations.
Fixes: QTBUG-111131
Pick-to: 6.5 6.4 6.2
Change-Id: I9605f9b3d5a49e292551a34c3c4c7a5f9ecb2a89
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>