When building with -Wno-deprecated-declarations the warnings listed below
remain.
=> so it seems the use of an incompatible type is the culprit here.
tray.c:634:19: error: assignment to ‘GtkWidget *’ {aka ‘struct _GtkWidget
*’} from incompatible pointer type ‘GObject *’ {aka ‘struct _GObject *’}
[-Wincompatible-pointer-types]
634 | tr->invisible = g_object_ref_sink(G_OBJECT(invisible));
| ^
See
https://github.com/lxde/lxpanel/commit/0853b0fc981285ebd2ac52f8dfc2a09b1090748c
for the corresponding upstream fix.
