*/app_process and multiple shell management

Hey Fredrik Fornwall
I sent you in November an email and did not receive an answer. In the meantime, I received an instruction from xeffyr (thanks) and also extent my own Termux experience. My dialogue with xeffyr mainly refers to x11/xorg, which probably have nothing to do with you - or?!
But I have another problem where you can hopefully help me.

First, what I've done:
the API base functions include xdg-open (termux-open), this calls */bin/am (all scripts) and this at the end execute /app_process. To the mc package belong .config/mc/mc.ext (corrected open by me), which refer to libexec/mc/ext.d/.sh and this at the end to /app_process too.

That worked well until Nov. 2018. Unfortunately, today I get an open problem (nicht geladen=not loaded).
In my issue https://github.com/termux/x11-packages/issues/49 I've explain it to xeffyr without solution. Insite is "The video: https://www.dropbox.com/s/lsyylstr9nsq3ml/Termux_mc.mp4?dl=0 - was created with an older Termux installation" - see from second: 45 to 1:07
To narrow that down, I've created and run a test script (~/t in 1+2. picture):

The used app (photos/gallery) is chosen "randomly" and the alternative (photos when v=EDIT) could not be used successfully even before Nov.2018. What is wrong? Where can I find a log file?

The next question (3. picture) relates to the management of several bash displays. Is this an API function? Is it possible to edit and change the navigation drawer (white) via a script e.g. in .bashrc or another (here I did it by hand) and how?

Reproduce the reported xdg-open/termux-open path through /bin/am, libexec/mc/ext.d/.sh, and /app_process, then inspect the ~/t test script and the linked x11-packages issue. A complete report would identify the relevant log location and establish whether navigation-drawer management is an API function or scriptable; the issue names no test or definitive expected behavior.