Remove ghost of canvas zoom controls during onion skinning

editor/plugins/animation_player_editor_plugin.cpp

@@ -1431,6 +1431,7 @@ void AnimationPlayerEditor::_prepare_onion_layers_2() {
 		new_state["show_rulers"] = false;
 		new_state["show_guides"] = false;
 		new_state["show_helpers"] = false;
+		new_state["show_zoom_control"] = false;
 		// TODO: Save/restore only affected entries
 		CanvasItemEditor::get_singleton()->set_state(new_state);
 	}

editor/plugins/canvas_item_editor_plugin.cpp

@@ -4515,6 +4515,7 @@ Dictionary CanvasItemEditor::get_state() const {
 	state["show_rulers"] = show_rulers;
 	state["show_guides"] = show_guides;
 	state["show_helpers"] = show_helpers;
+	state["show_zoom_control"] = zoom_hb->is_visible();
 	state["show_edit_locks"] = show_edit_locks;
 	state["snap_rotation"] = snap_rotation;
 	state["snap_relative"] = snap_relative;
@@ -4643,6 +4644,11 @@ void CanvasItemEditor::set_state(const Dictionary &p_state) {
 		view_menu->get_popup()->set_item_checked(idx, show_edit_locks);
 	}
 
+	if (state.has("show_zoom_control")) {
+		// This one is not user-controllable, but instrumentable
+		zoom_hb->set_visible(state["show_zoom_control"]);
+	}
+
 	if (state.has("snap_rotation")) {
 		snap_rotation = state["snap_rotation"];
 		int idx = snap_config_menu->get_popup()->get_item_index(SNAP_USE_ROTATION);