can't drag between 2 grids with max row set

[Justin99b]

Subject of the issue

Widgets collide and bug over each other when hovering over another grid

Your environment

Gridstack (the verison used on the official site) sorry dont know that one) (V4 if im not mistaken) <- 4.0.1
Chrome Version 89.0.4389.90 (64-Bit)

Steps to reproduce

https://gridstackjs.com/#demo
when moving the item from top to bottom (i hope thats eough to reproduce)

Expected behavior

Widget does not collide with others and just can correctly place back like in the previous v3 versions

Actual behavior

When dragging one widget to another grid and then back (without releasing it) the widget will come nearly impossible to place back in the old grid and even collid or stack on to another object.
Its also happening when just dragging it into another grid.
You can also see the collision happening here https://gridstackjs.com/demo/advance.html
p.s im sorry if im not giving enough information.
if you need anything more please comment

[adumesny]

can you please provide a video because I'm not seeing your issue. you can also try using https://gridstackjs.com/demo/two.html or a modified version if you need 2 grids.

[Justin99b]

Actually i found out how to reproduce it

https://jsfiddle.net/rhq02fkL/29/
https://gyazo.com/de4abc0265c37760a7e8e8b71338b7ab

[adumesny]

should not see two drop shadow when #393 was fixed....

Also see issues with your demo outside of this:

1. you say 3 column but don't include extra.css so CSS layout is hosed when dragging around.
2. you call addGrid() which creates nested .grid-stack divs (I have a local fix) as parent incorrectly has '.grid-stack' style (see you CSS doubling the border)
3. resize handles are always showing. resizable:false is NOT an options - use disableResize:true instead (I can see why you made that mistake)

regardless I can see 2 drop shadows when doing vertical grids, so I will create demo for that so I can fix.

[Justin99b]

oh? Well im working on an inventory system with gridstack and use addGrid to dynamicly add grids. didnt know that this is the wrong way of doing it

[Justin99b]

Okay i've updated my example with your fixes named just to make sure its correct

https://jsfiddle.net/hfjr65qw/32/

Also its not only the drop shadow
here is a video of it happening in a different scenario. but you can recreate it with the link above

This example is even more broken than my version somehow lol

https://gyazo.com/3aa64bfd28f08147595a66440fff6a81
https://gyazo.com/a77811b3982037bf013b5653b2003a5a

[adumesny]

Also its not only the drop shadow

I know, but that is the clue bad things will happen!

Update: actually the real issue with is with row:1 setting maxRow which goes through very different code path I had not tested