RenderController : Reuse locations when `childNames` changes
RenderController : Reuse locations when `childNames` changes

Fixes #2690.

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