GrabHelper automatically releases grabs when the user clicks outside
the grabbed actors. However at least for the message-tray (which is
the only user of grabHelper at the moment), we must ignore any events
from the On-Screen-Keyboard, to prevent the tray from hiding at every
key press.
https://bugzilla.gnome.org/show_bug.cgi?id=683546
Currently clicks outside the grabbed actors are handled the same as
the user pressing Escape - a single actor is popped from the grab stack.
However according to the design, outside clicks should release all grabs.
https://bugzilla.gnome.org/show_bug.cgi?id=682243
When Dan Winship wrote the GrabHelper code originally, it didn't
handle a grab stack. I wrote the grab stack code hastily when landed
the message tray, not understanding all of the code that was involved
here.
Fix it so that we properly do the operations for each type of grab
when we first need to, and not sometimes when the first grab is taken.
https://bugzilla.gnome.org/show_bug.cgi?id=683546
Users of GrabHelper.grab() espect that the actor parameter (or one of its
children) will receive focus, irrespective of the previous focus location.
This fixes the key focus on the chat entry when expanding the notification.
https://bugzilla.gnome.org/show_bug.cgi?id=683449
If the user has the mouse down - for example when they are selecting
text and dragging - then the attempt to get a modal grab will fail.
grabHelper: allow the .grab() function to fail and do nothing in this
modal case if the grab fails.
messageTray: handle grab failure and don't pop up the tray. Change the
logic for tray dwelling so that we only try to pop up the tray once
while the pointer is in the dwell area - this avoids the possiility
that the tray will pop up once the user releases the mouse.
https://bugzilla.gnome.org/show_bug.cgi?id=682385
When we enter the overview, we don't explicitly don't take a grab, so we
shouldn't connect to key-focus-changed and things like that, otherwise
random overview code will drop our grab for us.
This fixes escape in the overview not dropping when a notification is up.
Make sure to account for modalCount properly, rather than just
tracking modalCount for the last actor on the stack. Additionally,
traverse the popped actors in the reverse order so that onUngrabbed
callbacks are called at the proper place in time.
