feat: Calculate width/height of canvas based on container dimensions (".excalidraw" selector) & remove props width & height (#3379)

* Remove width/height from the ".excalidraw" container so it will sized automatically.
* updated all ref calculation to ".excalidraw" instead of parent since now ".excalidraw" will get resized
* Remove props width/height as its not needed anymore.
* Resize handler is also not needed anymore.
* Position absolute canvas due to #3379 (comment)

* move css to style and remove one extra rerendering

* factor out mock logic for test

* set height, width so as to avoid unnecessary updates of regression snap

* better mock

* better type checking and omit width,height from getDefaultAppState and also restore

* revert

* default to window dimensions in constructor

* update docs

* update

* update

* tweaks

src/excalidraw-app/index.tsx

@@ -3,7 +3,6 @@ import React, {
   useCallback,
   useContext,
   useEffect,
-  useLayoutEffect,
   useRef,
   useState,
 } from "react";
@@ -163,30 +162,10 @@ const initializeScene = async (opts: {
 };
 
 const ExcalidrawWrapper = () => {
-  // dimensions
-  // ---------------------------------------------------------------------------
-
-  const [dimensions, setDimensions] = useState({
-    width: window.innerWidth,
-    height: window.innerHeight,
-  });
   const [errorMessage, setErrorMessage] = useState("");
   const currentLangCode = languageDetector.detect() || defaultLang.code;
   const [langCode, setLangCode] = useState(currentLangCode);
 
-  useLayoutEffect(() => {
-    const onResize = () => {
-      setDimensions({
-        width: window.innerWidth,
-        height: window.innerHeight,
-      });
-    };
-
-    window.addEventListener("resize", onResize);
-
-    return () => window.removeEventListener("resize", onResize);
-  }, []);
-
   // initial state
   // ---------------------------------------------------------------------------
 
@@ -337,8 +316,6 @@ const ExcalidrawWrapper = () => {
       <Excalidraw
         ref={excalidrawRefCallback}
         onChange={onChange}
-        width={dimensions.width}
-        height={dimensions.height}
         initialData={initialStatePromiseRef.current.promise}
         onCollabButtonClick={collabAPI?.onCollabButtonClick}
         isCollaborating={collabAPI?.isCollaborating()}