Patch for possible bug in TeX-find-macro-end-helper

Hi everyone, I was meaning to use TeX-find-macro-end-helper from tex.el for a package I am working on, but I found it has a behavior which strikes me as undesirable. It's of course very possible that I am missing something, but here is the current behavior in 13.1 and in master. Here are the

master e97fb94f: Pacify compiler warning

branch: master commit e97fb94f4ecb230faa33267fc45799daa37f6d4a Author: Arash Esbati Commit: Arash Esbati Pacify compiler warning * context.el (ConTeXt-expand-options): Use `string=' instead of `eq' to compare strings. --- context.el | 2 +- 1 file changed, 1 insertion(+), 1

master bf66b302: Improve the previous commit slightly

branch: master commit bf66b302a4afa297fc2322a875935fd9a4d47525 Author: Ikumi Keita Commit: Ikumi Keita Improve the previous commit slightly * latex.el (LaTeX-current-environment,LaTeX-backward-up-environment): Move the task to find out the environment name from the latter to