xftaskbar: Minimize by click on an entry doesnt always work

[Danny]

Hi!

I've just noticed something...
If a window has a transient dialog (f. e. a send and receive status
window from evolution ^^), and you try to minimize it by clicking the
entry in the taskbar, it doesn't work. After the transient dialog is
gone (i. e. the mail fetching is finished), minimizing that way works
again.

Minimizing with the "Minimize" button from the window itself works in
all cases...

cheers
   Danny