patch 9.0.0032: in the quickfix window 'cursorline' overrules QuickFixLine

Problem:    In the quickfix window 'cursorline' overrules QuickFixLine
            highlighting.
Solution:   Combine the attributes.  Add a test. (closes #10654)
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 2a97375..2431a46 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -3136,6 +3136,12 @@
   call term_sendkeys(buf, ":cnext\<CR>")
   call VerifyScreenDump(buf, 'Test_quickfix_cwindow_2', {})
 
+  call term_sendkeys(buf, "\<C-W>j:set cursorline\<CR>")
+  call VerifyScreenDump(buf, 'Test_quickfix_cwindow_3', {})
+
+  call term_sendkeys(buf, "j")
+  call VerifyScreenDump(buf, 'Test_quickfix_cwindow_4', {})
+
   " clean up
   call StopVimInTerminal(buf)
   call delete('XtestCwindow')