patch 9.1.2107: :normal may change cmdline history

Problem:  :normal may change cmdline history if the keys don't
          explicitly leave Cmdline mode (after 9.1.1872).
Solution: Check ex_normal_busy (zeertzjq)

closes: #19237

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/ex_getln.c

@@ -1871,7 +1871,7 @@ getcmdline_int(
 				// that occurs while typing a command should
 				// cause the command not to be executed.
 
-	if (stuff_empty() && typebuf.tb_len == 0)
+	if (ex_normal_busy == 0 && stuff_empty() && typebuf.tb_len == 0)
 	    // There is no pending input from sources other than user input, so
 	    // Vim is going to wait for the user to type a key.  Consider the
 	    // command line typed even if next key will trigger a mapping.

src/testdir/test_cmdline.vim

@@ -2675,6 +2675,7 @@ func Test_recalling_cmdline_with_mappings()
   call assert_equal("echo 'bar'", histget(':', -1))
   call assert_equal("echo 'foo'", histget(':', -2))
 
+  let g:cmdline = ''
   " This command comes completely from a mapping.
   nmap <F3> :echo 'baz'<F2><CR>
   call feedkeys("\<F3>", 'tx')
@@ -2684,6 +2685,15 @@ func Test_recalling_cmdline_with_mappings()
   call assert_equal("echo 'bar'", histget(':', -1))
   call assert_equal("echo 'foo'", histget(':', -2))
 
+  let g:cmdline = ''
+  " A command coming from :normal is ignored in the history even if the keys
+  " don't explicitly leave Cmdline mode.
+  exe "normal :echo 'baz'\<F2>"
+  call assert_equal("echo 'baz'", g:cmdline)
+  call assert_equal("echo 'bar'", @:)
+  call assert_equal("echo 'bar'", histget(':', -1))
+  call assert_equal("echo 'foo'", histget(':', -2))
+
   if has('unix')
     new
     call setline(1, ['aaa'])

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2107,
 /**/
     2106,
 /**/