GUI (wx?) problem on Linux dists

[briantoby]

The python distribution provided for Linux is not working properly, at least on some dists of Linux. This has been seen on RHEL 7.9 & 9.4 and also Ubuntu 22.04. What happens is that X11 graphics will "hang" particularly when working with textctrl widgets. Sometimes this message is seen:

but not always.

Some improvement is seen with an older version of Python, but spotless behavior was seen after installing Ubuntu's Python along with Python packages from Ubuntu.

One thing worth trying is use of wxpython via pip rather than from conda-forge.

[briantoby]

Here is GSAS-II running with Linux & wxpython from conda-forge, It shows the app hanging after I have changed text in a wx.TextCtrl

LinuxBug.mp4

FWIW, Same problems on RHEL 7.9 & 9.4.
FWIW, same bug using conda-forge Python and wxpython 4.2.2 installed from pip on RHEL 9.5.

Here is the same app (running exactly the same code) but using Python installed with apt-get on Ubuntu using their Python, wx, mpl, etc.

LinuxWorks.mp4

Here this runs fine..

The image I use is this:
bright_1s_000759.pxrd.h5_ave_1s_norm.tif.zip (N.B. This is a "16 bit Pixirad" TIF file.) Here is a .gpx file
with the image.

[briantoby]

This does appear to be a problem arising from our own code, even though it seems to be Linux specific (and not even on all Python versions). The customized wx.TextCtrl class we use seems to be causing this.

[briantoby]

The SetFocus in the SetValue method of ValidatedTxtCtrl seemed to be causing problems, but another much more pervasive problem is that the calls to .SetValue for routines being used as a callback to a ValidatedTxtCtrl widget were causing recursion issues.

[briantoby]

maybe, just maybe, this is solved in a6ec664.

[lcgallington]

We are experiencing this problem again on a RHEL 9 machine at 1-ID.