Indentation in Latex within a list after an equation

Question

Here is a minimal .tex file:

\begin{document}
    \begin{itemize}
        \item Here is an equation:
        \begin{align*}
            x = y
        \end{align*}
        \item Here is another item
    \end{itemize}
\end{document}

I would like to make the second item bold. If I put my cursor before the H and put

\textbf{

while in insert mode, the line de-indents as soon as the bracket is put in place.

My question is how can I prevent this behavior? I would like no indentation.

The problem seems to be the equation environment. If that is removed then I get the desired behavior.

Here is my .vimrc:

set nocompatible
filetype plugin indent on
syntax enable

The behavior goes away if I remove

filetype plugin indent on

but then I also lose some other desired functionality.

Ultimately, I will be using this with https://github.com/lervag/vimtex. So solutions involving that plugin would be welcome as well.

Answer 1

The reason this is happening is because the indentexpr [1] prefers text to be indented inside \items. You can see this by pressing gg=G. This is what it considers correct indenting:

\begin{document}
\begin{itemize}
    \item Here is an equation:
        \begin{align*}
            x = y
        \end{align*}
    \item Here is another item
\end{itemize}
\end{document}

When you type \textbf{ (specifically the {), it realizes that the \item should be un-indented compared to the text above it (\end{align*}. To disable this, you can put

let g:tex_indent_items=0 into your vimrc (only works with vim's default tex indent)

If you simply don't like the jumping (i.e., re-indenting) when pressing { behavior, consider:

set indentkeys-={ indentkeys-=}

[1] By default, vim uses GetTeXIndent() as its indentexpr; vimtex uses a different indentexpr.