Subtle GUI bug #3226

Subject of the issue

Using BASIC demo on gridstack.js.com.
While resizing, drag handles appear on other widgets.

Your environment

gridstack 12.4.2 in Chromium 143.0.7499.40 on Manjaro

Steps to reproduce

Mouse click resize handle on widget 4 and while holding drag left over onto the Drag me! widget.
The Drag me widget shows the resize handler.

Expected behavior

While a widget is being resized, the handlers should never appear on any of the other widgets.