Eric Pouech : comctl32/tests: Fix failing WM_PASTE tests for edit control on Win10+.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: ee5cdea92206050776753c6ac49cc156407be7ad
URL:    https://gitlab.winehq.org/wine/wine/-/commit/ee5cdea92206050776753c6ac49cc15...

Author: Eric Pouech 
Date:   Mon Jan  9 09:31:07 2023 +0100

comctl32/tests: Fix failing WM_PASTE tests for edit control on Win10+.

There are cases in Windows10+ where the WM_PASTE message doesn't paste
the content of the clipboard.

This appeared in testing:
- almost always just after (for a couple of milliseconds) setting new
  content into the clipboard and closing it.
- in some unrelated rare occasions (like once for 400 runs).

It looks like another (installed) process had opened the clipboard and
forbids the paste command.
As WM_PASTE doesn't return success/error status, workaround it by
wrapping the WM_PASTE command into a helper, and retry when the
clipboard's content hasn't been pasted.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53276
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53277
Signed-off-by: Eric Pouech

---

dlls/comctl32/tests/edit.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/dlls/comctl32/tests/edit.c b/dlls/comctl32/tests/edit.c
index fae3091533b..f45b898dc12 100644
--- a/dlls/comctl32/tests/edit.c
+++ b/dlls/comctl32/tests/edit.c
@@ -3246,6 +3246,26 @@ static void test_EM_GETHANDLE(void)
     DestroyWindow(hEdit);
 }

+/* In Windows 10+, the WM_PASTE message isn't always successful.
+ * So retry in case of failure.
+ */
+#define check_paste(a, b) _check_paste(__LINE__, (a), (b))
+static void _check_paste(unsigned int line, HWND hedit, const char *content)
+{
+    /* only retry on windows platform */
+    int tries = strcmp(winetest_platform, "wine") ? 3 : 1;
+    int len = 0;
+
+    SendMessageA(hedit, WM_SETTEXT, 0, (LPARAM)"");
+    do
+    {
+        SendMessageA(hedit, WM_PASTE, 0, 0);
+        if ((len = SendMessageA(hedit, WM_GETTEXTLENGTH, 0, 0))) break;
+        Sleep(1);
+    } while (--tries > 0);
+    ok_(__FILE__, line)(len == strlen(content), "Unexpected len %u in edit\n", len);
+}
+
 static void test_paste(void)
 {
     static const char *str = "this is a simple text";
@@ -3253,7 +3273,7 @@ static void test_paste(void)
     HWND hEdit, hMultilineEdit;
     HANDLE hmem, hmem_ret;
     char *buffer;
-    int r, len;
+    int r;

hEdit = create_editcontrol(ES_AUTOHSCROLL | ES_AUTOVSCROLL, 0);
     hMultilineEdit = create_editcontrol(ES_AUTOHSCROLL | ES_AUTOVSCROLL | ES_MULTILINE, 0);
@@ -3276,10 +3296,7 @@ static void test_paste(void)
     ok(r == TRUE, "expected %d, got %d\n", TRUE, r);

/* Paste single line */
-    SendMessageA(hEdit, WM_SETTEXT, 0, (LPARAM)"");
-    r = SendMessageA(hEdit, WM_PASTE, 0, 0);
-    len = SendMessageA(hEdit, WM_GETTEXTLENGTH, 0, 0);
-    ok(strlen(str) == len, "got %d\n", len);
+    check_paste(hEdit, str);

/* Prepare clipboard data with multiline text */
     hmem = GlobalAlloc(GMEM_MOVEABLE, 255);
@@ -3300,15 +3317,10 @@ static void test_paste(void)

/* Paste multiline text in singleline edit - should be cut */
     SendMessageA(hEdit, WM_SETTEXT, 0, (LPARAM)"");
-    r = SendMessageA(hEdit, WM_PASTE, 0, 0);
-    len = SendMessageA(hEdit, WM_GETTEXTLENGTH, 0, 0);
-    ok(strlen("first line") == len, "got %d\n", len);
+    check_paste(hEdit, "first line");

/* Paste multiline text in multiline edit */
-    SendMessageA(hMultilineEdit, WM_SETTEXT, 0, (LPARAM)"");
-    r = SendMessageA(hMultilineEdit, WM_PASTE, 0, 0);
-    len = SendMessageA(hMultilineEdit, WM_GETTEXTLENGTH, 0, 0);
-    ok(strlen(str2) == len, "got %d\n", len);
+    check_paste(hMultilineEdit, str2);

/* Cleanup */
     DestroyWindow(hEdit);