GtkMenuTracker: fix signal handler argument list

The signal handler for the visibility of menu items changing had the
wrong signature, resulting in the GParamSpec from the notify signal
being treated as a boolean (which was always true).  This resulted in
items being added over and over and never being removed.

Fix that...
combobox: Fix reentrancy in gtk_combo_box_popdown()

If called when already popped down, warnings would be issued due
to priv->grab_pointer being unexpectedly NULL, this would happen
in regular operation when selecting items in appears-as-list mode.

So both add a NULL check for priv->grab_pointer, and bail out early
if the popup window is already hidden.
MSVC 2010+ Projects: Update "Installation" Process

Currently, due to the way that Visual Studio 2010+ projects are handled,
the "install" project does not re-build upon changes to the sources, as it
does not believe that its dependencies have changed, although the changed
sources are automatically recompiled.  This means that if a part or more
of the solution does not build, or if the sources need some other fixes
or enhancements, the up-to-date build is not copied automatically, which
can be misleading.

Improve on the situation by forcing the "install" project to trigger its
rebuild, so that the updated binaries can be copied.  This does trigger an
MSBuild warning, but having that warning is way better than not having an
up-to-date build, especially during testing and development.
GtkEntryAccessible: Emit signal after insertion

The signal needs to be emitted after the text insertion as at-spi gets
the text to compute the inserted text due to the AtkText::insert-text
signal not containing it.
Also adjust position to reflect changes to the offsets.

https://bugzilla.gnome.org/show_bug.cgi?id=731429
Revert "GtkMenuTracker: fix signal handler argument list"

This reverts commit f15f13a0fb9ef0f362c44d300bae48e2c1946dfe.

This fix applied on master but it makes no sense here (where we have an
actual signal rather than just a property notify).
gtkpopover: set background and popover css classes