commit https://github.com/vim/vim/commit/58adb14739fa240ca6020cede9ab1f1cb07bd90a Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 16 21:50:51 2016 +0100 patch 7.4.1108 Problem: Expanding "~" halfway a file name. Solution: Handle the file name as one name. (Marco Hinz) Add a test. Closes https://github.com/vim/vim/issues/564.

--- a/src/misc2.c
+++ b/src/misc2.c
@@ -5543,7 +5543,7 @@ find_file_in_path_option(ptr, len, optio
 	/* copy file name into NameBuff, expanding environment variables */
 	save_char = ptr[len];
 	ptr[len] = NUL;
-	expand_env(ptr, NameBuff, MAXPATHL);
+	expand_env_esc(ptr, NameBuff, MAXPATHL, FALSE, TRUE, NULL);
 	ptr[len] = save_char;
 
 	vim_free(ff_file_to_find);