Fixes text input widget undo propagation.

If not handled, undo propagates to other random widgets,
and if none takes it, it is resent as a redo to all widgets.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/Fl_Text_Editor.cxx b/src/Fl_Text_Editor.cxx
index c548ef6be..29fb0d6e3 100644
--- a/src/Fl_Text_Editor.cxx
+++ b/src/Fl_Text_Editor.cxx
@@ -663,7 +663,13 @@ int Fl_Text_Editor::handle_key() {
   Key_Func f;
   f = bound_key_function(key, state, global_key_bindings);
   if (!f) f = bound_key_function(key, state, key_bindings);
-  if (f) return f(key, this);
+  if (f == kf_undo || f == kf_redo) {
+    // never propagate undo and redo up to another widget
+    if (!f(key, this)) fl_beep();
+    return 1;
+  } else if (f){
+    return f(key, this);
+  }
   if (default_key_function_ && !state) return default_key_function_(c, this);
   return 0;
 }