bug#52705: 29.0.50; Flashing popups when x-gtk-use-system-tooltips is nil in pgtk

[martin rudalics <rudalics@gmx.at>]

 > Hmm, could you try putting SET_FRAME_VISIBLE (f, 1) after this line in
 > `x_create_tip_frame':
 >
 >      gtk_window_set_attached_to (GTK_WINDOW (tip_window), FRAME_GTK_WIDGET (p));
 >      gtk_window_set_destroy_with_parent (GTK_WINDOW (tip_window), TRUE);
 >      gtk_window_set_decorated (GTK_WINDOW (tip_window), FALSE);
 >      gtk_window_set_type_hint (GTK_WINDOW (tip_window), GDK_WINDOW_TYPE_HINT_TOOLTIP);
 >      f->output_data.pgtk->current_cursor = f->output_data.pgtk->text_cursor;
 > ->  gtk_widget_show_all (FRAME_GTK_OUTER_WIDGET (f));
 >
 > The signal handler in `map_event' in pgtkterm.c should set the frame's
 > visibility, but it seems that for some reason it isn't being triggered,
 > even though we do set up event handling.

This has the effect that the tooltip becomes invisible forever after it
has been shown once.

Note all I do with emacs -Q is to evaluate

(progn
   (setq x-gtk-use-system-tooltips nil)
   (setq tooltip-reuse-hidden-frame t))

and move the mouse over the mode line.

martin