[BUG] New widgets added by .load() displace existing widgets  #2639

Subject of the issue

New widgets created by the .load() method are rendered in the middle of the grid and displace existing widgets.

This behavior doesn't match .addWidget() which places new widgets in the next available slot without displacing.

Screenshots

.addWidget(newItem)	.load(items + newItem)

Your environment

Version: 10.0.1 & 10.1.1
Browser/OS: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Steps to reproduce

Demo: https://jsfiddle.net/2g4zarb8/

1. Create a new node with auto position (no w or h).
2. Add the widget using .addWidget() and observe it in the next open horizontal spot.
3. Add the same widget using .load() and observe it in the middle of the grid.

Expected behavior

New widgets are placed consistently regardless of which method was used. In this case I'd expect new widget added with .load() to be placed in the same location .addWidget() would.