Fix grid editor mutably changing grid state

src/components/map/MapGridEditor.js

@@ -77,7 +77,10 @@ function MapGridEditor({ map, onGridChange }) {
       Vector2.subtract(position, previousPosition)
     );
 
-    const inset = map.grid.inset;
+    const inset = {
+      topLeft: { ...map.grid.inset.topLeft },
+      bottomRight: { ...map.grid.inset.bottomRight },
+    };
 
     if (direction.x === 0 && direction.y === 0) {
       return inset;

src/helpers/grid.js

@@ -212,7 +212,10 @@ export function getGridDefaultInset(grid, mapWidth, mapHeight) {
  * @returns {GridInset}
  */
 export function getGridUpdatedInset(grid, mapWidth, mapHeight) {
-  let inset = grid.inset;
+  let inset = {
+    topLeft: { ...grid.inset.topLeft },
+    bottomRight: { ...grid.inset.bottomRight },
+  };
   // Take current inset width and use it to calculate the new height
   if (grid.size.x > 0 && grid.size.x > 0) {
     // Convert to px relative to map size