clipproperties: Preserve selection on clicking Remove Effect

Authored by suhas2go on May 10 2017, 10:48 PM.

Description

clipproperties: Preserve selection on clicking Remove Effect

Previously clicking on Remove Effect cleared the selection inside the effects
treeview, this preserves selection at that position in the list.

This fixes T7788.

Differential Revision: https://phabricator.freedesktop.org/D1798