patch 8.1.1840: Testing: WorkingClipboard() is not accurate

Problem:    Testing: WorkingClipboard() is not accurate.
Solution:   Check feature clipboard_working instead.

src/testdir/shared.vim

@@ -322,13 +322,3 @@ func RunVimPiped(before, after, arguments, pipecmd)
   endif
   return 1
 endfunc
-
-func WorkingClipboard()
-  if !has('clipboard')
-    return 0
-  endif
-  if has('x11')
-    return $DISPLAY != ""
-  endif
-  return 1
-endfunc

src/testdir/test_paste.vim

@@ -70,9 +70,8 @@ func Test_paste_insert_mode()
 endfunc
 
 func Test_paste_clipboard()
-  if !WorkingClipboard()
-    return
-  endif
+  CheckFeature clipboard_working
+
   let @+ = "nasty\<Esc>:!ls\<CR>command"
   new
   exe "normal i\<C-R>+\<Esc>"

src/testdir/test_quotestar.vim

@@ -1,11 +1,9 @@
 " *-register (quotestar) tests
 
 source shared.vim
-if !WorkingClipboard()
-  throw 'Skipped: no working clipboard'
-endif
+source check.vim
 
-source shared.vim
+CheckFeature clipboard_working
 
 func Do_test_quotestar_for_macunix()
   if empty(exepath('pbcopy')) || empty(exepath('pbpaste'))

src/testdir/test_termcodes.vim

@@ -182,9 +182,7 @@ func Test_xterm_mouse_ctrl_click()
 endfunc
 
 func Test_term_mouse_middle_click()
-  if !WorkingClipboard()
-    throw 'Skipped: No working clipboard'
-  endif
+  CheckFeature clipboard_working
 
   new
   let save_mouse = &mouse

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1840,
 /**/
     1839,
 /**/