The list of popovers will specify the stacking order, a
_gtk_window_raise_popover() private call has been added so popover
widgets can request being on top.
Also, the stacking on popovers is ensured on gtk_window_size_allocate(),
after the size/stacking changes on the child widget have finished, this
will ensure popovers are kept on top of window contents.
https://bugzilla.gnome.org/show_bug.cgi?id=756670
Previous commit 305b34a "GtkWindow: fix move/get position with CSD"
introduced a regression because some windows presumably use shadows but
actually don't, resulting in a negative offset being wrongly applied.
Problem is that get_shadow_width() would return non-zero shadows even
for windows that have no shadow, thus causing the negative offset.
Fix the logic in get_shadow_width() and gtk_window_should_use_csd() so
that get_shadow_width() returns accurate values.
Bugzilla: https://bugzilla.gnome.org/show_bug.cgi?id=756618
Use the element name menuitem for GtkMenuItem, GtkCheckMenuItem
and GtkRadioMenuItem. GtkSeparatorMenuItem gets the name separator.
Add a subnode with name arrow if a submenu is attached.
Give the radio and check menu items a subnode with name check or
radio.
Use the element name menu for the main node, and use two subnodes
with name arrow and style classes .top and .bottom for the arrows
of scrolling menus.
GtkMenu and GtkMenuBar, the two implementations of GtkMenuShell in GTK,
already draw it.
Furthermore, rendering a background here will overdraw any rendering
that the subclass will do, such as arrows for scrolling menus.
This is kind of a hack the way it's implemented, but it's necessary
for performance to ignore transient nodes as they get created all the
time (via gtk_style_context_save()) and invalidate the whole treeview.
And that causes resizes and redrawing of the treeview and performance of
the inspector would go down the drain now that we display a larger part
of the node tree.
Use combobox as the element name for the main CSS nodes of
GtkComboBox and GtkComboBoxText. Add the .combo style class
to the button and entry. in a GtkComboBox or GtkComboBoxText.
Unfortunately, GtkFileChooserButton is different from the other
pickers in that it is not a button, but rather has a button.
We ignore the difference for styling purposes, and just add
a .file style class to the button.
When the CSS style of a node changes, we want to display the new values
in the inspector.
This for example allows to see how styles update on hover or during
animations.
