Resize multiple elements (rectangles, diamonds and ellipses onl… (#1193)

* experiment resizing multiple elements

* hack common component

* calculate scale properly (still se only)fg

* prioritize multi selection

* take handle offset into calculation

* fix master merge

* refactor resizeElements out from App

* wip: handlerRectanglesFromCoords

* fix test with type assertion

* properly show handles wip

* revert previous one and do a tweak

* remove unnecessary assignments

* replace hack code with good one

* refactor coords in arg

* resize NW

* resize from sw,ne

* fix with setResizeHandle

* do not show hint while resizing multiple elements

* empty commit

* fix format

src/tests/regressionTests.test.tsx

@@ -162,12 +162,13 @@ function getSelectedElement(): ExcalidrawElement {
   return selectedElements[0];
 }
 
+type HandlerRectanglesRet = keyof ReturnType<typeof handlerRectangles>;
 function getResizeHandles() {
-  const rects = handlerRectangles(
-    getSelectedElement(),
-    h.state.zoom,
-    pointerType,
-  );
+  const rects =
+    handlerRectangles(getSelectedElement(), h.state.zoom, pointerType) as
+    {
+      [T in HandlerRectanglesRet]: [number, number, number, number];
+    };
 
   const rv: { [K in keyof typeof rects]: [number, number] } = {} as any;