patch 9.0.0507: cmdline cleared when using :redrawstatus in CmdlineChanged

Problem:    Command line cleared when using :redrawstatus in CmdlineChanged
            autocommand event.
Solution:   Postpone the redraw. (closes #11162)

src/ex_docmd.c

@@ -8427,12 +8427,15 @@ ex_redrawstatus(exarg_T *eap UNUSED)
     int		r = RedrawingDisabled;
     int		p = p_lz;
 
-    RedrawingDisabled = 0;
-    p_lz = FALSE;
     if (eap->forceit)
 	status_redraw_all();
     else
 	status_redraw_curbuf();
+    if (State & MODE_CMDLINE)
+	return;  // redraw later
+
+    RedrawingDisabled = 0;
+    p_lz = FALSE;
     update_screen(VIsual_active ? UPD_INVERTED : 0);
     RedrawingDisabled = r;
     p_lz = p;

src/testdir/dumps/Test_redrawstatus_in_autocmd_1.dump

@@ -0,0 +1,8 @@
+|~+0#4040ff13#ffffff0| @73
+|~| @73
+|~| @73
+|o+0#0000000&|n|e| @71
+|t|w|o| @71
+|t|h|r|e@1| @69
+|f|o|u|r| @70
+|:|f|o@1|b|a|r> @67

src/testdir/test_cmdline.vim

@@ -210,6 +210,25 @@ func Test_redraw_in_autocmd()
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_redrawstatus_in_autocmd()
+  CheckScreendump
+
+  let lines =<< trim END
+      set cmdheight=2
+      autocmd CmdlineChanged * if getcmdline() == 'foobar' | redrawstatus | endif
+  END
+  call writefile(lines, 'XTest_redrawstatus', 'D')
+
+  let buf = RunVimInTerminal('-S XTest_redrawstatus', {'rows': 8})
+  call term_sendkeys(buf, ":echo \"one\\ntwo\\nthree\\nfour\"\<CR>")
+  call term_sendkeys(buf, ":foobar")
+  call VerifyScreenDump(buf, 'Test_redrawstatus_in_autocmd_1', {})
+
+  " clean up
+  call term_sendkeys(buf, "\<CR>")
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_changing_cmdheight()
   CheckScreendump
 

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    507,
 /**/
     506,
 /**/