This avoids a bunch of policy problems with deciding how to lay
out the window menu under different WMs.
For now, we use the special event _GTK_SHOW_WINDOW_MENU, but we
hope to have this standardized in wm-spec quite soon, as KDE wants
it as well.
We see an active link when creating the menu, but by the time
the menuitem is activated, we've received a leave notify that
makes the label clear its active link. Instead, give the
menuitems a direct reference to the link that is active when
the menu is created.
Problem pointed out by Tim Baedert
We know the objects in a size group are always widgets, so we
can avoid hard-to-track down problems with weak references by
just cleaning up when the object gets destroyed. There is still
a chance that we show a widget as part of the group after it
has been removed, but size groups simply have no signals that
would let us avoid that.
Add a tab that shows size groups of a widget. The properties
of the size group are available here, as well as the widgets
that are part of the size group. We highlight the widgets in
the application when their row in the inspector is hovered.
In contrast to the flashing, where we blink the widget a
few times, this is explicitly turned on and off.
It will be used for indicating widgets that are part of
a size group, in the next commit.
The focus widget might be unset, just to be set again on a widget inside
the popover. Have the popover wait till the focus is actually moved outside
before dismissing.
Move away from cell editing, and use a popover instead. This makes
it easier to e.g. use a color chooser - there's just not enough room
in a cell for many things.
Much of this code is adapted from tests/prop-editor.c.
The child properties in GtkAssistant are somewhat broken, since
they are not on direct children - but that is no reason to crash
if somebody does ask for child properties of direct children.
When a model is sortable, but the the column is not currently used
for sorting, we want to reserve the space for showing the sort
indicator. But we currently set the icon to 'missing-image', which
is not great to show all over the place. So, just set the opacity
to 0.
With the keybinding, it is possible that users may trigger the
inspector unintentionally. Show a dialog that informs them about
whats going on and gives them a chance to back out.
The warning dialog can be bypassed with the
org.gtk.Settings.Debug inspector-warning setting.
Update visual.c to use Windows themes rather than the stock Raleigh theme,
and avoid hardcoding data paths for Windows (and Mac). As the dlfcn.h
functions are only used when Python is enabled, move its inclusion there[*].
Also ensure that variables are declared on the top of the block.
[*] Python support Windows needs to be investigated, as POSIX signal
handling is used there.
https://bugzilla.gnome.org/show_bug.cgi?id=730236
