justinpark commented on PR #26699:
URL: https://github.com/apache/superset/pull/26699#issuecomment-1933167329

   > one comment about the header thing Sophie mentioned: when you try to hover 
over it it shows a red box (error), which gave me an idea. I think maybe it 
could be used in places where there is not enough space to place the item, for 
example if the row is full.
   
   I had a similar thought as well, but there are complexities when it comes to 
dropping an existing component into a space that's just enough. 
   Specifically, it's challenging to programmatically differentiate this from 
the prohibited drop zones.
   
   (For instance, the highlight box should not turn red when item [1] is 
dropped into a zone without space, as it's possible to reorder among the same 
row items. However, it should turn red when item [4] is dropped into a zone 
without space.)
   |[ 1 ]|[ 2 ]|[ 3 ][no space drop zone]|
   --------
   |[ 4 ]|[             ]|
   
   Therefore, I've decided to retain the post notification as it is currently 
displayed.


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