[wp-trac] [WordPress Trac] #40811: Gallery drag and drop breaks layout

[WordPress Trac]

#40811: Gallery drag and drop breaks layout
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 Reporter:  smerriman     |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Gallery       |    Version:  4.7.5
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Starting with an example gallery:

 [[Image(https://cldup.com/hcwGa3LYIW-3000x3000.png)]]

 1) If I start dragging the nth item in a row, n blank spaces are created
 in the next row, eg:

 [[Image(https://cldup.com/_Fbgdjcs1w-3000x3000.png)]]

 2) The exception is when I start dragging the last item in a row - as soon
 as I start to drag, a blank space appears where the current item / the
 mouse is, and the actual item I am dragging appears a long way from the
 mouse (in the first position in the next row).

 [[Image(https://cldup.com/8j0d3aCFrk-3000x3000.png)]]

 This occurs in Firefox in Windows on a clean WordPress installation with
 no plugins installed. Testing in Chrome, I get the same results with the
 exception of dragging the 2nd or 4th item in a row, which work perfectly
 (1st and 3rd cause gaps; last breaks).

 I expect this is due to rounding in some way, and it appears to differ
 based on the width of your browser. If I go into Firefox responsive view
 and set a width of 1366px, everything works perfectly. 1367px works for
 all but the last image in a row, while 1369px has everything broken.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40811>
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