Improve subfiles support

[slideclimb]

• Autocompletion of command in reguired file path argument

Summary of additions and changes

• Expand commands in filenames (once)
  • in autocompletion of file name
  • in file not found inspection
  • resolving input file references

How to test this pull request

main.tex

\providecommand{\main}{.}
\documentclass[11pt]{article}

\usepackage{subfiles}

\begin{document}
    \subfile{nest/sub.tex}
    \subfile{\main/nest/sub.tex}
\end{document} 

nest/sub.tex

\providecommand{\main}{..}
\documentclass[\main/main.tex]{subfiles}

\begin{document}
    \includegraphics{\main/nest/sub2.tex}
\end{document}

nest/sub2.tex can be empty.

See also the test resources completion/path/commandexpansion, completion/path/relativetoroot and inspections/latex/filenotfound/commandexpansion

Wiki

• Updated the wiki: