Thanks for your report.
I can confirm this bug, and I found that it only work under GTK+2.0 Apps, It doesn't work under GTK+3.0 apps like Software Center.
I will try to research more about this.
Thanks for your report.
I can confirm this bug, and I found that it only work under GTK+2.0 Apps, It doesn't work under GTK+3.0 apps like Software Center.
I will try to research more about this.