patch 9.1.1289: tests: no test for matchparen plugin with WinScrolled event

Problem:  tests: no test for matchparen plugin with WinScrolled event
Solution: add missing test

closes: #10942

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_plugin_matchparen.vim b/src/testdir/test_plugin_matchparen.vim
index 13d6e9e..dca6e32 100644
--- a/src/testdir/test_plugin_matchparen.vim
+++ b/src/testdir/test_plugin_matchparen.vim
@@ -177,4 +177,28 @@
   call StopVimInTerminal(buf)
 endfunc
 
+" Test for the WinScrolled event
+func Test_scroll_winenter()
+  CheckScreendump
+
+  let lines =<< trim END
+    source $VIMRUNTIME/plugin/matchparen.vim
+    set scrolloff=1
+    call setline(1, ['foobar {', '', '', '', '}'])
+    call cursor(5, 1)
+  END
+
+  let filename = 'Xmatchparen_winscrolled'
+  call writefile(lines, filename, 'D')
+
+  let buf = RunVimInTerminal('-S '.filename, #{rows: 7})
+  call VerifyScreenDump(buf, 'Test_matchparen_winscrolled1', {})
+  call term_sendkeys(buf, "\<C-E>")
+  call VerifyScreenDump(buf, 'Test_matchparen_winscrolled2', {})
+  call term_sendkeys(buf, "\<C-Y>")
+  call VerifyScreenDump(buf, 'Test_matchparen_winscrolled1', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab