[PATCH 1/1] win32u: Try the next top-level window if hit-testing the result window returns HTTRANSPARENT.

[Zhiyi Zhang]

From: Zhiyi Zhang

Fix clicking Toad for Oracle treeview nodes doesn't function. The left button click is sent to a
top-level TSafeHintWindow, which returns HTTRANSPARENT when handling WM_NCHITTEST. Tests show that
in such cases, the mouse message should be sent to the next top-level window in the z-order.
---
 dlls/user32/tests/input.c | 8 ++++----
 dlls/win32u/message.c     | 2 ++
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/dlls/user32/tests/input.c b/dlls/user32/tests/input.c
index 9196e67c15b..677b2714fcc 100644
--- a/dlls/user32/tests/input.c
+++ b/dlls/user32/tests/input.c
@@ -4233,12 +4233,12 @@ static void test_SendInput_mouse_messages(void)

mouse_event( MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0 );
     wait_messages( 5, FALSE );
-    button_down_hwnd_todo[1].message.hwnd = hwnd;
-    ok_seq( button_down_hwnd_todo );
+    button_down_hwnd[1].message.hwnd = hwnd;
+    ok_seq( button_down_hwnd );
     mouse_event( MOUSEEVENTF_LEFTUP, 0, 0, 0, 0 );
     wait_messages( 5, FALSE );
-    button_up_hwnd_todo[1].message.hwnd = hwnd;
-    ok_seq( button_up_hwnd_todo );
+    button_up_hwnd[1].message.hwnd = hwnd;
+    ok_seq( button_up_hwnd );

ok_ret( 1, DestroyWindow( other ) );
     wait_messages( 0, FALSE );
diff --git a/dlls/win32u/message.c b/dlls/win32u/message.c
index a0cbfbce95c..3d0db361d78 100644
--- a/dlls/win32u/message.c
+++ b/dlls/win32u/message.c
@@ -2444,6 +2444,8 @@ static BOOL process_mouse_message( MSG *msg, UINT hw_id, ULONG_PTR extra_info, H
                 is_current_thread_window( next ))
                 msg->hwnd = window_from_point( next, msg->pt, &hittest );
         }
+        if (!msg->hwnd) /* Try the next top-level window */
+            msg->hwnd = window_from_point( 0, msg->pt, &hittest );
     }

if (!msg->hwnd || !is_current_thread_window( msg->hwnd ))