Improves latex snippets

.config/nvim/UltiSnips/tex.snippets

@@ -74,6 +74,7 @@ snippet '([A-Za-z])_(\d\d)' "auto subscript2" wrA
 `!p snip.rv = match.group(1)`_{`!p snip.rv = match.group(2)`}
 endsnippet
 
+context "math()"
 snippet __ "subscript" iA
 _{$1}$0
 endsnippet
@@ -126,31 +127,27 @@ endsnippet
 
 context "math()"
 snippet () "left( right)" iA
-\left( ${1:${VISUAL}} \right) $0
+\left( ${1:${VISUAL}} \right)$0
 endsnippet
 
 snippet lr "left( right)" i
-\left( ${1:${VISUAL}} \right) $0
-endsnippet
-
-snippet lr( "left( right)" i
-\left( ${1:${VISUAL}} \right) $0
+\left(${1:${VISUAL}}\right)$0
 endsnippet
 
 snippet lr| "left| right|" i
-\left| ${1:${VISUAL}} \right| $0
+\left| ${1:${VISUAL}} \right|$0
 endsnippet
 
 snippet lr{ "left\{ right\}" i
-\left\\{ ${1:${VISUAL}} \right\\} $0
+\left\\{ ${1:${VISUAL}} \right\\}$0
 endsnippet
 
 snippet lrb "left\{ right\}" i
-\left\\{ ${1:${VISUAL}} \right\\} $0
+\left\\{ ${1:${VISUAL}} \right\\}$0
 endsnippet
 
 snippet lr[ "left[ right]" i
-\left[ ${1:${VISUAL}} \right] $0
+\left[ ${1:${VISUAL}} \right]$0
 endsnippet
 
 snippet lra "leftangle rightangle" iA

.config/nvim/ftplugin/tex.vim

@@ -8,6 +8,7 @@ let g:vimtex_compiler_latexmk = {
         \   '-file-line-error',
         \   '-synctex=1',
         \   '-interaction=nonstopmode',
+		\   '-shell-escape',
         \ ],
         \}
 let g:vimtex_view_method = 'zathura'