WidgetAlgo : Force repolish in `joinEdges()`
WidgetAlgo : Force repolish in `joinEdges()`

Otherwise the effect may not be immediately visible. This fixes an update glitch in the SceneInspector Sets section.

appleseedhq/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,boberfly/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,hradec/gaffer,boberfly/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,hradec/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,hradec/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,ivanimanishi/gaffer,boberfly/gaffer,ImageEngine/gaffer,hradec/gaffer,appleseedhq/gaffer,hradec/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,boberfly/gaffer,ivanimanishi/gaffer