Short term goals

rewrite syntax highlighting to be line oriented instead of word oriented. handle first part of line based on regular expressions, then advance and only highlight strings and numbers. handle "&" continuation and multiline strings with """ like C style comments in Qt docs example
add "syntax check" with enabled "-skiprun" flag
need to handle "label" and "jump" commands from within ?
switch input file editor to read-only while loop is running
triple quoted heredocs don't work with lammps_commands_string()

Long term ideas

rewrite entire application to build the App and its layout manually
port to Qt6
also a rewrite should establish consistent naming conventions. now we have a mix of LAMMPS style, Qt style, and others.
add option to attach a debugger to the running program (highly non-portable, need customization support in preferences)
write a "wizard" dialog that can be used for beginners to create an input file template for a few typical use scenarios
support single stepping, i.e. process input line by line (need to detect continuation chars!) with highlighting active line(s)
have command text input line in/above status bar where individual commands can be tested. have insert button to copy line into file at the current point
support text completion as done with lammps-shell