Improve support for "subfiles" package.

[kbauer]

The subfiles package is useful for speeding up previews when working on large documents, without overwriting the main file with incomplete \includeonly settings. Currently, compilation of the subfile can be enabled by setting the root document either through Options > Root Document or by using the % !TeX root = sub magic comment. Either way, by changing the root document, completion information is lost.

How to reproduce

• Download the example files example.zip
• Type \ref in sub.tex.

Expected behavior

• Completion for \ref{sec:A} should be suggested.

Actual behavior

• No completion is suggested.

Partial Workaround

• Set up pdflatex to compile the current document instead, by specifying ?c:m" instead of % or ?m" as the file name. Sadly, this breaks the "View" command, as ?c:m" expands to the root document in the context of the viewer command (see ?c: selector not working with txs:///view-pdf-internal #248).

Environment

• TeXstudio: 2.12.10
• Qt: Using Qt Version 5.8.0, compiled with Qt 5.8.0 R
• OS: Windows 10 (Microsoft Windows [Version 10.0.17134.165])
• TeX distribution: MikTeX

[ComFreek]

I think the lack of support also breaks completion for bibliography and \cite as \addbibresource is not found.

[muzimuzhi]

@kbauer
With the right position and content of magic comment % !TeX root = <root filename>, your example now works on texstudio 2.12.16 on macOS.

• right position: magic comment should be at the beginning of file, not after \documentclass
• right content: ! TeX root = accepts name of root filename, e.g. main.tex in your example, not the current filename.

Modified sub.tex:

% !TeX root = main.tex
\documentclass[main]{subfiles}

\begin{document}
\section{B}
\lipsum[2]

\end{document}

Screenshot of auto-completion:

[muzimuzhi]

@ComFreek
\addbibresource is defined in package biblatex, and is currently included in completion file biblatex.cwl.

texstudio/completion/biblatex.cwl

Lines 10 to 11 in 42252b2

	\addbibresource{bibliographic resource}#b
	\addbibresource[options]{bibliographic resource}

The original issue has nothing to do with biblatex. So if you come up with a similar problem, you can open a new issue and refer to the current one.

[mbertucci47]

I think this issue is fixed regardless of specification of % !TeX root = ... so can be closed. Screenshot below: