patch 8.2.0905: test coverage could be better

Problem:    Test coverage could be better.
Solution:   Add a couple of tests. (Dominique Pelle, closes #6202)

src/testdir/test_cmdline.vim

@@ -1220,6 +1220,22 @@ func Test_cmd_bang()
   call delete('Xresult')
 endfunc
 
+" Test error: "E135: *Filter* Autocommands must not change current buffer"
+func Test_cmd_bang_E135()
+  new
+  call setline(1, ['a', 'b', 'c', 'd'])
+  augroup test_cmd_filter_E135
+    au!
+    autocmd FilterReadPost * help
+  augroup END
+  call assert_fails('2,3!echo "x"', 'E135:')
+
+  augroup test_cmd_filter_E135
+    au!
+  augroup END
+  %bwipe!
+endfunc
+
 " Test for using ~ for home directory in cmdline completion matches
 func Test_cmdline_expand_home()
   call mkdir('Xdir')

src/testdir/test_ga.vim

@@ -25,6 +25,7 @@ func Test_ga_command()
   " Test a few multi-bytes characters.
   call assert_equal("\n<é> 233, Hex 00e9, Oct 351, Digr e'",    Do_ga('é'))
   call assert_equal("\n<ẻ> 7867, Hex 1ebb, Oct 17273, Digr e2", Do_ga('ẻ'))
+  call assert_equal("\n<\U00012345> 74565, Hex 00012345, Octal 221505", Do_ga("\U00012345"))
 
   " Test with combining characters.
   call assert_equal("\n<e>  101,  Hex 65,  Octal 145 < ́> 769, Hex 0301, Octal 1401", Do_ga("e\u0301"))

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    905,
 /**/
     904,
 /**/