And get the embedder before continuing, as the backend-specific
get_monitor_at_window () only knows about its own windows.
In order to check for offscreen windows, we introduce a new function
gdk_window_is_impl_offscreen (). Unlike gdk_window_is_offscreen (),
it doesn't rely on the window_type field, but actually checks whether
GDK_WINDOW_IMPL_GET_CLASS (window->impl) is GdkOffscreenWindow.
See previous commit for informations.
Checking for offscreen windows with gdk_window_is_offscreen ()
is not enough in this case. What we want here is that the impl
classes match, as backends are meant to know only about their
windows. Instead gdk_window_is_offscreen () checks whether the
GdkWindow.window_type field is GDK_WINDOW_OFFSCREEN.
In the case of child windows in offscreen windows, the window
type is GDK_WINDOW_CHILD, even though their impl is still
GdkOffscreenWindow.
So actually check whether GDK_WINDOW_IMPL_GET_CLASS (window)
matches GDK_WINDOW_IMPL_GET_CLASS (parent).
We may also consider getting the toplevels from child windows,
as transient-for relationships are really about toplevels, but
child windows doesn't seem to cause problems in practice.
This was basically done copying the gtk4 version and keeping the changes
that weren't gtk4 specific.
Fixes#6224 (the chooser doesn't close but we don't crash or such)
The Adwaita cursor theme is moving to shipping just standard cursor
names, so we should fall back to 'default' instead of 'left_ptr' if
a named cursor can't be found.
Fixes: #6259
gdk_keymap_get_entries_for_keyval is supposed to return FALSE when no
keys were found. Do so to prevent careless clients (that don't check
n_keys too) from crashing.
The color channels are swapped on Linux too, not only on Windows. It can be
reproduced by running the "OpenGL Area" example from gtk3-demo with
GDK_GL=gles, or play a video in totem with GDK_GL=gles.
Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/3032
