[PATCH v3 4/4] riched20/tests: Add retry loop around OpenClipboard() to avoid access denial.

[Eric Pouech]

From: Eric Pouech

Reusing existing helper from user32 & comctl32.

https://bugs.winehq.org/show_bug.cgi?id=47888

Signed-off-by: Eric Pouech 
---
 dlls/riched20/tests/richole.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/dlls/riched20/tests/richole.c b/dlls/riched20/tests/richole.c
index d648354729e..fc0a13b506f 100644
--- a/dlls/riched20/tests/richole.c
+++ b/dlls/riched20/tests/richole.c
@@ -4907,6 +4907,35 @@ static void test_character_movement(void)
   ITextRange_Release(range);
 }

+static BOOL open_clipboard(HWND hwnd)
+{
+  DWORD start = GetTickCount();
+  while (1)
+  {
+    BOOL ret = OpenClipboard(hwnd);
+    if (ret || GetLastError() != ERROR_ACCESS_DENIED)
+      return ret;
+    if (GetTickCount() - start > 100)
+    {
+      char classname[256];
+      DWORD le = GetLastError();
+      HWND clipwnd = GetOpenClipboardWindow();
+      /* Provide a hint as to the source of interference:
+       * - The class name would typically be CLIPBRDWNDCLASS if the
+       *   clipboard was opened by a Windows application using the
+       *   ole32 API.
+       * - And it would be __wine_clipboard_manager if it was opened in
+       *   response to a native application.
+       */
+      GetClassNameA(clipwnd, classname, ARRAY_SIZE(classname));
+      trace("%p (%s) opened the clipboard\n", clipwnd, classname);
+      SetLastError(le);
+      return ret;
+    }
+    Sleep(15);
+  }
+}
+
 #define CLIPBOARD_RANGE_CONTAINS(range, start, end, expected) _clipboard_range_contains(range, start, end, expected, __LINE__, 0);
 #define TODO_CLIPBOARD_RANGE_CONTAINS(range, start, end, expected) _clipboard_range_contains(range, start, end, expected, __LINE__, 1);
 static void _clipboard_range_contains(ITextRange *range, LONG start, LONG end, const char *expected, int line, int todo)
@@ -4921,7 +4950,7 @@ static void _clipboard_range_contains(ITextRange *range, LONG start, LONG end, c
   hr = ITextRange_Copy(range, NULL);
   ok_(__FILE__,line)(hr == S_OK, "Copy failed: 0x%08lx\n", hr);

-  clipboard_open = OpenClipboard(NULL);
+  clipboard_open = open_clipboard(NULL);
   ok_(__FILE__,line)(clipboard_open, "OpenClipboard failed: %ld\n", GetLastError());
   global = GetClipboardData(CF_TEXT);
   ok_(__FILE__,line)(global != NULL, "GetClipboardData failed: %p\n", global);