Fix syntax problem with \emph (fixes #245 and #272)

after/syntax/tex.vim

@@ -14,7 +14,8 @@ endif
 " {{{1 Add conceal for \emph
 if has('conceal') && get(g:, 'tex_conceal', 'b') =~# 'b'
   syntax region texItalStyle
-        \ matchgroup=texTypeStyle start="\\emph\s*{" end="}" concealends
+        \ matchgroup=texTypeStyle start="\\emph\s*{" end="}"
+        \ concealends contains=@texItalGroup
 endif
 
 " }}}1

autoload/vimtex/change.vim

@@ -66,8 +66,18 @@ function! vimtex#change#get_command(...) " {{{1
   let l:char = l:line[l:position[1]-1]
 
   " Lists of relevant syntax regions
-  let l:commands = ['texStatement', 'texTypeSize', 'texTypeStyle', 'texBeginEnd']
-  let l:argument = ['texMatcher', 'texRefZone', 'texBeginEndName']
+  let l:commands = [
+        \ 'texStatement',
+        \ 'texTypeSize',
+        \ 'texTypeStyle',
+        \ 'texBeginEnd',
+        \ ]
+  let l:argument = [
+        \ 'texMatcher',
+        \ 'texItalStyle',
+        \ 'texRefZone',
+        \ 'texBeginEndName',
+        \ ]
 
   for l:syntax in reverse(map(call('synstack', l:position),
         \ 'synIDattr(v:val, ''name'')'))

test/issue-272/main.tex

@@ -1,4 +1,4 @@
 \documentclass{minimal}
 \begin{document}
-\emph{$a+1$}
+\emph{Italized text and $a+1$.}
 \end{document}