Render text actions panel on double click (#450)

* Render text actions panel on double click

* cleanup wysiwyg on click

* use `state.editingElement` instead of global to determine whether t ext panel is shown

* clarify comment

Co-authored-by: David Luzar <luzar.david@gmail.com>

src/types.ts

@@ -3,6 +3,9 @@ import { ExcalidrawElement } from "./element/types";
 export type AppState = {
   draggingElement: ExcalidrawElement | null;
   resizingElement: ExcalidrawElement | null;
+  // element being edited, but not necessarily added to elements array yet
+  //  (e.g. text element when typing into the input)
+  editingElement: ExcalidrawElement | null;
   elementType: string;
   exportBackground: boolean;
   currentItemStrokeColor: string;