Whenever a panel is activated, there is a GtkBox that
is added between the window and the panel itself.
Investigating the history of this field, it originally
appeared at ec7f8c9b when the window started using
widgets rather than page numbers. Apparently, it was a
GtkBox to help dealing with the GtkNotebook (which was
later changed to the current GtkStack).
The field was renamed from 'current_panel' to 'current_panel_box'
at ab435aa9. But since the transition to GtkStack, there
is no real need to use the GtkBox anymore.
This patch removes this GtkBox, and as a consequence, the
code is slightly simplified.
[8/15] Compiling C object 'panels/background/panels@background@@background-chooser@sta/cc-background-xml.c.o'.
In file included from /usr/include/glib-2.0/gobject/gbinding.h:29:0,
from /usr/include/glib-2.0/glib-object.h:23,
from /usr/include/glib-2.0/gio/gioenums.h:28,
from /usr/include/glib-2.0/gio/giotypes.h:28,
from /usr/include/glib-2.0/gio/gio.h:26,
from ../panels/background/cc-background-xml.c:22:
../panels/background/cc-background-xml.c: In function ‘cc_background_xml_load_xml_internal’:
/usr/include/glib-2.0/gobject/gobject.h:512:32: warning: passing argument 2 of ‘emit_added_in_idle’ from incompatible pointer type [-Wincompatible-pointer-types]
#define g_object_ref(Obj) ((__typeof__(Obj)) (g_object_ref) (Obj))
^
../panels/background/cc-background-xml.c:310:34: note: in expansion of macro ‘g_object_ref’
emit_added_in_idle (xml, g_object_ref (item));
^~~~~~~~~~~~
../panels/background/cc-background-xml.c:138:1: note: expected ‘GObject * {aka struct _GObject *}’ but argument is of type ‘CcBackgroundItem * {aka struct _CcBackgroundItem *}’
emit_added_in_idle (CcBackgroundXml *xml,
^~~~~~~~~~~~~~~~~~
The correct time to remove custom widgets is precisely
after we checked if the panel can be activated, and before
creating the panel. We were not following that, and it was
causing the panels with header widgets to never actually
show their custom widgets.
Fix that by calling remove_all_custom_widgets() at the
correct point in panel creation.
