[gtk/BUG_tooltip_position_CLEAN] GtkTooltip: fix tooltip position when inside a Popover in Wayland

[Nelson Ben <nbenitez src gnome org>]

commit 3954acc6f75420e16dd66dcf8bdcf4753d717873
Author: Nelson Benítez León <nbenitezl gmail com>
Date:   Mon Oct 19 19:14:56 2020 -0400

    GtkTooltip: fix tooltip position when inside a Popover in Wayland
    
    When pointer is over a Popover in Wayland, gdk_window_get_device_position()
    call fails to retrieve x relative to the passed in toplevel widget,
    and instead returns x relative to the Popover. So to fix that behaviour
    in the GtkTooltip code, we use gtk_widget_translate_coordinates()
    to obtain the x offset of the Popover wrt the toplevel widget, and then
    add that to the previous incomplete pointer_x so now pointer_x contains
    the expected x relative to the 'effective_toplevel' widget.
    
    This fixes issue #1708

 gtk/gtktooltip.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
---
diff --git a/gtk/gtktooltip.c b/gtk/gtktooltip.c
index 9917d93197..065f30a416 100644
--- a/gtk/gtktooltip.c
+++ b/gtk/gtktooltip.c
@@ -41,6 +41,7 @@
 
 #ifdef GDK_WINDOWING_WAYLAND
 #include "wayland/gdkwayland.h"
+#include "gtkpopover.h"
 #endif
 
 
@@ -933,6 +934,26 @@ gtk_tooltip_position (GtkTooltip *tooltip,
                                       device,
                                       &pointer_x, &pointer_y, NULL);
 
+#ifdef GDK_WINDOWING_WAYLAND
+      if (GDK_IS_WAYLAND_DISPLAY (display))
+        {
+         /* When pointer is over a Popover in Wayland, previous gdk_window_get_device_position()
+          * call fails to retrieve x relative to the passed in 'effective_toplevel' widget, and
+          * instead returns x relative to the Popover, so to obtain the expected semantic (for
+          * this buggy case) we use gtk_widget_translate_coordinates() to obtain the x offset of
+          * the Popover wrt the toplevel widget, and then add that to pointer_x so now pointer_x
+          * contains the expected x relative to the 'effective_toplevel' widget. Issue #1708
+          */
+          GtkWidget *popover = gtk_widget_get_ancestor (new_tooltip_widget, GTK_TYPE_POPOVER);
+          if (popover)
+            {
+              int popover_x;
+              gtk_widget_translate_coordinates (popover, toplevel, 0, 0, &popover_x, NULL);
+              pointer_x += popover_x;
+            }
+        }
+#endif
+
       if (anchor_rect.height > max_anchor_rect_height)
         {
           anchor_rect.x = pointer_x - 4;