Merge pull request #18782 from toger5/fix_no_a_input_script_editor_osx

fixed 'A' input not registered in osx script editor

scene/gui/text_edit.cpp

@@ -2851,7 +2851,7 @@ void TextEdit::_gui_input(const Ref<InputEvent> &p_gui_input) {
 				}
 				select_all();
 #else
-				if (k->get_alt()) {
+				if (k->get_alt() || (!k->get_shift() && !k->get_command() && !k->get_control())) {
 					scancode_handled = false;
 					break;
 				}