minor fix for dockable borders.
minor fix for dockable borders.

dbkaplun/blessed,rosshinkley/blessed,gdseller/blessed,eush77/blessed,zBMNForks/blessed,eush77/blessed,umi/blessed,piranna/blessed,umi/blessed,anko/blessed,gdseller/blessed,rstr74/blessed,mcanthony/blessed,anko/blessed,piranna/blessed,chjj/blessed,mcanthony/blessed,rosshinkley/blessed,zBMNForks/blessed,chjj/blessed,rstr74/blessed,dbkaplun/blessed