neovim: Add conceal for stmaryrd symbols

users/simon/modules/neovim/init.lua

@@ -333,6 +333,19 @@ g.vimtex_quickfix_ignore_filters = {
     [[Package typearea Warning: Bad type area settings!]],
 }
 
+g.vimtex_syntax_custom_cmds = {
+    {
+        name = 'llbracket',
+        mathmode = true,
+        concealchar = '⟦',
+    },
+    {
+        name = 'rrbracket',
+        mathmode = true,
+        concealchar = '⟧',
+    },
+}
+
 -- When using math environments vim does not know if if it currently is in one or outside of one
 -- unless it parses the file from the start.
 -- Parsing the file from the start each time fixes this