feat(syntax): support mathparpagebreakable

refer: lervag#3153

Author: lervag

autoload/vimtex/syntax/p/amsmath.vim

@@ -12,7 +12,6 @@ function! vimtex#syntax#p#amsmath#load(cfg) abort " {{{1
         \ 'alignat',
         \ 'flalign',
         \ 'gather',
-        \ 'mathpar',
         \ 'multline',
         \ 'xalignat',
         \]

autoload/vimtex/syntax/p/mathpartir.vim

@@ -0,0 +1,18 @@
+" VimTeX - LaTeX plugin for Vim
+"
+" Maintainer: Karl Yngve Lervåg
+" Email:      karl.yngve@gmail.com
+"
+
+function! vimtex#syntax#p#mathpartir#load(cfg) abort " {{{1
+  call vimtex#syntax#core#new_env(#{
+        \ name: 'mathpar',
+        \ math: v:true
+        \})
+  call vimtex#syntax#core#new_env(#{
+        \ name: 'mathparpagebreakable',
+        \ math: v:true
+        \})
+endfunction
+
+" }}}1