Single-click/tap to open grid delegate item
Right now opening grid delegates is accomplished by double-clicking/tapping on them, or clicking/tapping once to select and then clicking/tapping on the "open" button. This patch changes the behavior to be single-click/tap to open. There several proposed justifications for this change:
- More touch-friendly: double-tap is awkward on touch, and tapping once to select and tapping on an "open" button is slow and cumbersome. Tapping once to open the item is much more user-friendly and conventional on touch.
- Avoids having multiple ways to do the same thing. Now instead of being able to enter by double-clicking or else clicking on the "open" hover button, you just click once.
- Avoids the issue described in https://bugs.kde.org/show_bug.cgi?id=417223 whereby the "open" button's icon was found to be somewhat lacking.
- Overall less visual clutter on the grid delegates
Opening with the return key when a delegate is selected still works, and keyboard navigation still works.
The applicable autotest is updated.