implement snap-free scroll constraints

examples/with-nextjs/src/excalidrawWrapper.tsx

@@ -5,6 +5,17 @@ import { Excalidraw } from "@excalidraw/excalidraw";
 import "@excalidraw/excalidraw/index.css";
 
 import App from "../../with-script-in-browser/components/ExampleApp";
+import type { ScrollConstraints } from "@excalidraw/excalidraw/types";
+
+const scrollConstraints: ScrollConstraints = {
+  x: 0,
+  y: 0,
+  width: 850,
+  height: 400,
+  lockZoom: true,
+  overscrollAllowance: 0,
+  viewportZoomFactor: 1,
+};
 
 const ExcalidrawWrapper: React.FC = () => {
   return (
@@ -14,7 +25,9 @@ const ExcalidrawWrapper: React.FC = () => {
         useCustom={(api: any, args?: any[]) => {}}
         excalidrawLib={excalidrawLib}
       >
-        <Excalidraw />
+        <Excalidraw
+        // scrollConstraints={scrollConstraints}
+        />
       </App>
     </>
   );

examples/with-script-in-browser/components/ExampleApp.tsx

@@ -820,6 +820,48 @@ export default function ExampleApp({
             />
             Export with embed scene
           </label>
+          <button
+            type="button"
+            onClick={() => {
+              if (!excalidrawAPI) {
+                return;
+              }
+
+              const elements = excalidrawAPI.getSceneElements();
+              excalidrawAPI.scrollToContent(elements[0], {
+                animate: true,
+                fitToViewport: true,
+                viewportZoomFactor: 0.9,
+                scrollLock: {
+                  lockZoom: true,
+                  overscrollAllowance: 0,
+                },
+              });
+            }}
+          >
+            Fit and lock first element
+          </button>
+          <button
+            type="button"
+            onClick={() => {
+              if (!excalidrawAPI) {
+                return;
+              }
+
+              const elements = excalidrawAPI.getSceneElements();
+              excalidrawAPI.scrollToContent(elements[1], {
+                animate: true,
+                fitToViewport: true,
+                viewportZoomFactor: 0.9,
+                scrollLock: {
+                  lockZoom: true,
+                  overscrollAllowance: 0,
+                },
+              });
+            }}
+          >
+            Fit and lock second element
+          </button>
           <button
             onClick={async () => {
               if (!excalidrawAPI) {