Don't call scroll if TextEdit is fully in view (#1779)

* Don't call scroll if TextEdit is fully in view

* Explain why the new logic was added

* cargo fmt

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

egui/src/widgets/text_edit/builder.rs

@@ -610,7 +610,8 @@ impl<'t> TextEdit<'t> {
                             &cursor_range.primary,
                         );
 
-                        if response.changed || selection_changed {
+                        let is_fully_visible = ui.clip_rect().contains_rect(rect); // TODO: remove this HACK workaround for https://github.com/emilk/egui/issues/1531
+                        if (response.changed || selection_changed) && !is_fully_visible {
                             ui.scroll_to_rect(cursor_pos, None); // keep cursor in view
                         }