[wp-trac] [WordPress Trac] #29606: Reorder images via drag and drop is not working in WP 4

[WordPress Trac]

#29606: Reorder images via drag and drop is not working in WP 4
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 Reporter:  gsarig        |       Owner:  ericandrewlewis
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  Future Release
Component:  Gallery       |     Version:  4.0
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:  ui
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Comment (by earnjam):

 I'm able to re-create the issue on both retina and non-retina displays in
 all browsers, however the problem is dependent on the window size and
 typically when you see it, if you resize the window larger or smaller, the
 issue goes away. The container sizes where the issue occurs varies between
 browser and screen type. This explains why some people see it and others
 do not.

 As I noted above
 (https://core.trac.wordpress.org/ticket/29606#comment:21), the problem can
 be seen when just using some very basic % width floated elements and
 jQuery UI Sortable.

 Sortable appears to round the calculated % widths when generating the
 placeholder and the dragged item because it needs a specific pixel width
 for the absolute positioning. Sometimes it gets rounded too large for the
 space available, so the browser then calculates the floated item as being
 on the next row.

 I think the solution is that Sortable probably needs more precise
 rounding, or perhaps to simply always round down, when calculating the
 current width of a floated element with a percentage width.

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Ticket URL: <https://core.trac.wordpress.org/ticket/29606#comment:31>
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