fix: prevent resize drift caused by stale props between renders (#255)

When React can't re-render between consecutive mousemove events,
this.props.width is stale and intermediate deltas are lost, causing
progressive drift where the element resizes slower than the mouse.

Use this.lastSize (already tracked for onResizeStop) as the base for
delta calculation during onResize, falling back to props for the first
event.

Author: WhiteMinds

lib/Resizable.js

@@ -127,8 +127,12 @@ export default class Resizable extends React.Component<Props, void> {
       if (axisV === 'n') deltaY = -deltaY;
 
       // Update w/h by the deltas. Also factor in transformScale.
-      let width = this.props.width + (canDragX ? deltaX / this.props.transformScale : 0);
-      let height = this.props.height + (canDragY ? deltaY / this.props.transformScale : 0);
+      // Use lastSize (if available) instead of props to avoid losing deltas
+      // when React can't re-render between consecutive mouse events.
+      const baseWidth = this.lastSize?.width ?? this.props.width;
+      const baseHeight = this.lastSize?.height ?? this.props.height;
+      let width = baseWidth + (canDragX ? deltaX / this.props.transformScale : 0);
+      let height = baseHeight + (canDragY ? deltaY / this.props.transformScale : 0);
 
       // Run user-provided constraints.
       [width, height] = this.runConstraints(width, height);