The mask returned by gtk_accelerator_get_default_mod_mask() should
work without additional filtering, in particular when it is overly
restrictive - a lot of shortcuts use the Super modifier nowadays,
so stop filtering it out.
https://bugzilla.gnome.org/show_bug.cgi?id=771058
gtk_accelerator_valid() doesn't accept Tab as keyval, so using it to
check whether a shortcut is valid breaks commonly used shortcuts like
Alt+Tab. Unbreak those by adding a small wrapper that special-cases
Tab-with-modifiers.
https://bugzilla.gnome.org/show_bug.cgi?id=771058
Before, when pressing "Backspace" in the editing dialogue, the
keybinding would be changed straight away, *behind* the dialogue, and
the dialogue would still be expecting a new shortcut.
Instead, we should make it behave like other shortcuts, which means
special handling empty shortcuts as valid ones.
https://bugzilla.gnome.org/show_bug.cgi?id=769314
We couldn't override gnome-shell's keybindings without having a working
grab, but the grab was only started when clicking the "edit" button when
editing a custom shortcut, or *after* receiving the first key press event.
To fix that problem, we need to grab the keyboard once we've shown the
dialog itself, but not in the ->map vfunc, otherwise it will block the
dialog from showing up. We set up a short timeout instead. Hopefully
this isn't too fragile.
https://bugzilla.gnome.org/show_bug.cgi?id=769314
In a0a15588, we starting using a separate shortcut editor window, which
was doing its own capture instead of using the GtkCellRendererAccel. But
this started grabbing both keyboard and pointer, making it impossible to
cancel captures using the pointer.
We now only grab keyboard keys, making the pointer usable again.
https://bugzilla.gnome.org/show_bug.cgi?id=769314
While waiting for keyboard input, as per the new proposed mockup,
the shortcut editor dialog should show a custom page with an icon
that indicates the required action. The current code, however, does
not expose this new customized page.
Fix that by adding this new page and controlling the time when it
shows and hides.
https://bugzilla.gnome.org/show_bug.cgi?id=769314
