Syntax highlight problem in inline block when variable name contains underline

[yanlinlin82]

Underline in variable name should not be treated as "emphasis". For example:

Show a value: **`r a_b`**

[jalvesaq]

Thanks for reporting the bug, but the region starting with ** is defined by syntax/markdown.vim and I don't know how to fix the issue in syntax/rmd.vim.

[yanlinlin82]

Intuitively thinking, syntax/markdown.vim should know nothing about the code chunks. That should probably be the reason of wrongly "emphasis". Will changing render order help to solve the problem?

[jalvesaq]

I've tried to include markdown syntax at the end of syntax/rmd.vim, but the result was the same.

[yanlinlin82]

I guess this should be an issue of syntax/markdown.vim rather than syntax/rmd.vim, since two lines in the following code snippet behave differently in vim highlight:

This is a test code chunk: `r a_b`.

This is another _test code chunk: `r a_b`_.

[yanlinlin82]

I found there have been issues about this problem, but unfortunately no any correct solution yet.

tpope/vim-markdown#16
tpope/vim-markdown#37
tpope/vim-markdown#27

[jalvesaq]

I guess that the solution (if any exists) might be in the use of the contains option in Markdown, but I also have tried to add/remove some contains to/from syntax/markdown.vim and couldn't find a solution.

[jalvesaq]

I deleted from the Vim-R-plugin the files that are already distributed as official Vim runtime files. Now, there is a new repository with these files: https://github.com/jalvesaq/R-Vim-runtime

Since the official runtime files are no longer in this repository, I'm closing this bug. This bug is already described in the Known bugs section of the README.md, and new bugs should be reported in the new repository.