desktoptoolbox: fix flickering on closing
The visible property needs to keep true until opacity becomes 0, otherwise the toolbox will flicker on closing.
BUG: 417849 FIXED-IN: 5.26 5.24.7
The visible property needs to keep true until opacity becomes 0, otherwise the toolbox will flicker on closing.
BUG: 417849 FIXED-IN: 5.26 5.24.7