fix: add an option for manually specifying the path to the vim binary

refer: lervag#2261

autoload/vimtex/view/zathura.vim

@@ -110,7 +110,8 @@ endfunction
 
 " }}}1
 
-let s:inverse_search_cmd = get(v:, 'progpath', get(v:, 'progname', ''))
+let s:inverse_search_cmd = get(g:, 'vimtex_callback_progpath',
+      \                      get(v:, 'progpath', get(v:, 'progname', '')))
       \ . (has('nvim')
       \   ? ' --headless'
       \   : ' -T dumb --not-a-term -n')

doc/vimtex.txt

@@ -2927,6 +2927,15 @@ OPTIONS                                                        *vimtex-options*
 
   Default value: 1
 
+*g:vimtex_callback_progpath*
+  The path to the vim binary that will be passed to viewers (for example
+  Zathura) for synctex callbacks. If unset, vimtex will fallback to use
+  |v:progpath|. You usually don't have to touch this variable, but if your
+  vim loads vimtex using a wrapper then it needs to be set otherwise
+  inverse search calls from viewers won't work.
+
+  Default value: unset
+
 *$VIMTEX_OUTPUT_DIRECTORY*
   This environment variable allows to specify the output directory of
   auxiliary LaTeX files. If it exists and is a valid path, this path will be