patch 8.0.0403: GUI tests may fail

Problem:    GUI tests may fail.
Solution:   Ignore the E285 error better. (Kazunobu Kuriyama)

src/testdir/test_gui.vim

@@ -85,15 +85,16 @@ func Test_quoteplus()
     let vim_exe = exepath(v:progpath)
     let testee = 'VIMRUNTIME=' . $VIMRUNTIME . '; export VIMRUNTIME;'
           \ . vim_exe
-	  \ . ' -f -g -u NONE -U NONE --noplugin --cmd ''%s'' -c ''%s'''
+	  \ . ' -u NONE -U NONE --noplugin --not-a-term -c ''%s'''
     " Ignore the "failed to create input context" error.
-    let cmd1 = 'call test_ignore_error("E285")'
-    let cmd2 = 'call feedkeys("'
+    let cmd = 'call test_ignore_error("E285") | '
+	  \ . 'gui -f | '
+	  \ . 'call feedkeys("'
           \ . '\"+p'
           \ . ':s/' . test_call . '/' . test_response . '/\<CR>'
           \ . '\"+yis'
           \ . ':q!\<CR>", "tx")'
-    let run_vimtest = printf(testee, cmd1, cmd2)
+    let run_vimtest = printf(testee, cmd)
 
     " Set the quoteplus register to test_call, and another gvim will launched.
     " Then, it first tries to paste the content of its own quotedplus register

src/testdir/test_gui_init.vim

@@ -15,7 +15,10 @@ func TearDown()
   call GUITearDownCommon()
 endfunc
 
-" Make sure that the tests will be done with the GUI activated.
+" Ignore the "failed to create input context" error.
+call test_ignore_error('E285')
+
+" Start the GUI now, in the foreground.
 gui -f
 
 func Test_set_guiheadroom()

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    403,
 /**/
     402,
 /**/