I'm trying to determine the actual pixel dimensions of my Android device.  In order to get the real height, it seems I need to first call "systemui 0x1e02"

The problem is that "borg systemui" returns immediately, but hasn't yet completed.

Here is an example that shows this problem.  I get two different screenheights: "1504" and then one second later: "1600"

------------------
borg systemui 0x1e02
puts [winfo screenheight .]
after 1000 {puts [winfo screenheight .]}
vwait forever
------------------

Might it be possible to have some way to know that systemui has completed?

If not, I can work around this (slight) problem by waiting 500ms.

Even if the SystemUI.setSystemUI run on the UI thread is synchronized with the caller (Tcl code) it is carried out asynchronously.

A better approach might be to "bind . <<ViewportUpdate>>" or (when your toplevel is in fullscreen mode) to "bind . <Configure>" and to watch out for "winfo screenheight" in the bound code.

The problem is most likely a designed feature by the Android framework.
And thus impossible to be solved. Therefore, closing this ticket.