projectgheist e7f3473595 PR #5699: Remove padding from scrollbar borders. ...

Because of the (2,2,2,2) default padding on two of the borders that make up the scrollbar, a scrollbar could only have a minimum width of 9, regardless of what the scrollbar thickness property was. Now a scrollbar of thickness 1 and of padding zero (and of brush images size of 1) will be of size 1.
The scrollbar outer padding is now exposed as a property with the same default values as before as to not affect existing widget layout (in SScrollBar, UScrollBar, SScrollBox and UScrollBox).
Since the padding around the child SSpacer for the scrollbar thumb went from (2,2,2,2) to zero, the scrollbar thickness values (default value and values explicitly set in code) have been incremented by 4 so that existing slate widget layout is not affected.
UMG scrollbar thickness data has been deprecated to add 4 to the serialized thickness value so that existing UMG widget layout is not affected.
User plugins could be affected by this change: if a thickness is specified by the plugin, the size of the scrollbar could end up being 4 pixels smaller than intended (but not necessarily; as it also depends on the size of the top/bottom slot images).

#jira UE-72558
#jira UE-72558
#rb Nick.Darnell

[CL 6397222 by Dave Belanger in Dev-Editor branch]

2019-05-09 08:24:44 -04:00

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