fix: dragging working not correct

The logic for calculating the positions of top and left in PR react-grid-layout#1323 is problematic. The compensation calculation for the containerPadding attribute should be placed in calcXY instead of being processed every time during dragging

lib/GridItem.jsx

@@ -503,27 +503,26 @@ export default class GridItem extends React.Component<Props, State> {
       const { offsetParent } = node;
 
       if (offsetParent) {
-        const { margin, rowHeight, containerPadding } = this.props;
+        const { margin, rowHeight } = this.props;
         const bottomBoundary =
           offsetParent.clientHeight - calcGridItemWHPx(h, rowHeight, margin[1]);
-        top = clamp(top - containerPadding[1], 0, bottomBoundary);
+        top = clamp(top, 0, bottomBoundary);
 
         const colWidth = calcGridColWidth(positionParams);
         const rightBoundary =
           containerWidth - calcGridItemWHPx(w, colWidth, margin[0]);
-        left = clamp(left - containerPadding[0], 0, rightBoundary);
+        left = clamp(left, 0, rightBoundary);
       }
     }
 
     const newPosition: PartialPosition = { top, left };
     this.setState({ dragging: newPosition });
 
     // Call callback with this data
-    const { containerPadding } = this.props;
     const { x, y } = calcXY(
       positionParams,
-      top - containerPadding[1],
-      left - containerPadding[0],
+      top,
+      left,
       w,
       h
     );
@@ -546,15 +545,15 @@ export default class GridItem extends React.Component<Props, State> {
     if (!this.state.dragging) {
       throw new Error("onDragEnd called before onDragStart.");
     }
-    const { w, h, i, containerPadding } = this.props;
+    const { w, h, i } = this.props;
     const { left, top } = this.state.dragging;
     const newPosition: PartialPosition = { top, left };
     this.setState({ dragging: null });
 
     const { x, y } = calcXY(
       this.getPositionParams(),
-      top - containerPadding[1],
-      left - containerPadding[0],
+      top,
+      left,
       w,
       h
     );