From 5cd7f2b56386c51d4f13c1c39aae0b9580824eb4 Mon Sep 17 00:00:00 2001
From: Jamie Linskell <james.linskell@aspentech.com>
Date: Wed, 12 Mar 2025 13:08:24 +0000
Subject: [PATCH] #2667 Fixed sidebar items not honouring gs-w and gs-h when
 dragging between multiple grids. Fixed gs-w and gs-h attributes being written
 back to original sidebar item

---
 src/gridstack.ts | 18 ++++++++++++++++--
 src/types.ts     |  2 ++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/gridstack.ts b/src/gridstack.ts
index cc873eda3..1f589e387 100644
--- a/src/gridstack.ts
+++ b/src/gridstack.ts
@@ -2215,6 +2215,12 @@ export class GridStack {
           return false; // prevent parent from receiving msg (which may be a grid as well)
         }
 
+        // If sidebar item, restore the sidebar node size to ensure consistent behavior when dragging between grids
+        if (node?._sidebarOrig) {
+          node.w = node._sidebarOrig.w;
+          node.h = node._sidebarOrig.h;
+        }
+
         // fix #1578 when dragging fast, we may not get a leave on the previous grid so force one now
         if (node?.grid && node.grid !== this && !node._temporaryRemoved) {
           // console.log('dropover without leave'); // TEST
@@ -2227,7 +2233,7 @@ export class GridStack {
         cellWidth = this.cellWidth();
         cellHeight = this.getCellHeight(true);
 
-        // sidebar items: load any element attributes if we don't have a node
+        // sidebar items: load any element attributes if we don't have a node on first enter from the sidebar
         if (!node) {
           const attr = helper.getAttribute('data-gs-widget') || helper.getAttribute('gridstacknode'); // TBD: temp support for old V11.0.0 attribute
           if (attr) {
@@ -2240,6 +2246,8 @@ export class GridStack {
             helper.removeAttribute('gridstacknode');
           }
           if (!node) node = this._readAttr(helper); // used to pass false for #2354, but now we clone top level node
+          // On first grid enter from sidebar, set the initial sidebar item size properties for the node
+          node._sidebarOrig = { w: node.w, h: node.h }
         }
         if (!node.grid) { // sidebar item
           if (!node.el) node = {...node}; // clone first time we're coming from sidebar (since 'clone' doesn't copy vars)
@@ -2661,7 +2669,10 @@ export class GridStack {
       this._updateContainerHeight();
 
       const target = event.target as GridItemHTMLElement;// @ts-ignore
-      this._writePosAttr(target, node);
+      // Do not write sidebar item attributes back to the original sidebar el
+      if (!node._sidebarOrig) {
+        this._writePosAttr(target, node);
+      }
       if (this._gsEventHandler[event.type]) {
         this._gsEventHandler[event.type](event, target);
       }
@@ -2687,7 +2698,10 @@ export class GridStack {
 
     this.engine.removeNode(node); // remove placeholder as well, otherwise it's a sign node is not in our list, which is a bigger issue
     node.el = node._isExternal && helper ? helper : el; // point back to real item being dragged
+    const sidebarOrig = node._sidebarOrig;
     if (node._isExternal) this.engine.cleanupNode(node);
+    // Restore sidebar item initial size info to stay consistent when dragging between multiple grids
+    node._sidebarOrig = sidebarOrig;
 
     if (this.opts.removable === true) { // boolean vs a class string
       // item leaving us and we are supposed to remove on leave (no need to drag onto trash) mark it so
diff --git a/src/types.ts b/src/types.ts
index fcf985567..05283a5cb 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -456,6 +456,8 @@ export interface GridStackNode extends GridStackWidget {
   _temporaryRemoved?: boolean;
   /** @internal true if we should remove DOM element on _notify() rather than clearing _id (old way) */
   _removeDOM?: boolean;
+  /** @internal original position/size of item if dragged from sidebar */
+  _sidebarOrig?: GridStackPosition;
   /** @internal had drag&drop been initialized */
   _initDD?: boolean;
 }