[gtk/gtk-4-2: 56/91] a11y: Avoid spurious selection changed events

[Matthias Clasen <matthiasc src gnome org>]

commit c04139405a7bfcb91cd8efa7f9acfc641009d31c
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Apr 20 13:23:56 2021 -0400

    a11y: Avoid spurious selection changed events
    
    Only send selection-changed events when we either
    had a non-empty selection before, or have one now.
    
    This should help orca speak the right things, and
    not the wrong things.
    
    Related: #3549

 gtk/a11y/gtkatspitext.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/gtk/a11y/gtkatspitext.c b/gtk/a11y/gtkatspitext.c
index 7cf08fdf06..44a5605716 100644
--- a/gtk/a11y/gtkatspitext.c
+++ b/gtk/a11y/gtkatspitext.c
@@ -1326,9 +1326,12 @@ update_selection (TextChanged *changed,
                   int          selection_bound)
 {
   gboolean caret_moved, bound_moved;
+  gboolean had_selection, has_selection;
 
   caret_moved = cursor_position != changed->cursor_position;
   bound_moved = selection_bound != changed->selection_bound;
+  had_selection = changed->cursor_position != changed->selection_bound;
+  has_selection = cursor_position != selection_bound;
 
   if (!caret_moved && !bound_moved)
     return;
@@ -1339,7 +1342,7 @@ update_selection (TextChanged *changed,
   if (caret_moved)
     changed->selection_changed (changed->data, "text-caret-moved", changed->cursor_position);
 
-  if (caret_moved || bound_moved)
+  if (had_selection || has_selection)
     changed->selection_changed (changed->data, "text-selection-changed", 0);
 }