patch 8.2.2303: Vim9: backtick expansion doesn't work for :foldopen Commit: https://github.com/vim/vim/commit/ecac591cce23919059a5d93ed2e94541b1be99b5 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 5 19:23:28 2021 +0100 patch 8.2.2303: Vim9: backtick expansion doesn't work for :foldopen Problem: Vim9: backtick expansion doesn't work for :foldopen. Solution: Do recognize backtick expansion. (closes https://github.com/vim/vim/issues/7621)

--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -7505,6 +7505,13 @@ compile_exec(char_u *line, exarg_T *eap,
 	}
     }
 
+    if (eap->cmdidx == CMD_folddoopen || eap->cmdidx == CMD_folddoclosed)
+    {
+	// TODO: should only expand when appropriate for the command
+	eap->arg = skiptowhite(eap->arg);
+	has_expr = TRUE;
+    }
+
     if (has_expr && (p = (char_u *)strstr((char *)eap->arg, "`=")) != NULL)
     {
 	int	count = 0;