user32: Add a heuristic to find the mouse message's window.

This can't be done properly without support from the native windowing system. However, it's a good bet to try the next window in the z-order if it's the owner of the original window and it's in the same thread. Signed-off-by: Huw Davies <huw@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

user32: Add a heuristic to find the mouse message's window.
0d9ce8a0 · Huw Davies · Alexandre Julliard · b1f8a91e · 0d9ce8a0
Commit 0d9ce8a0 authored Feb 06, 2018 by Huw Davies Committed by Alexandre Julliard Feb 06, 2018
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message.c dlls/user32/message.c +9 -0

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--- a/dlls/user32/message.c
+++ b/dlls/user32/message.c
@@ -2502,7 +2502,16 @@ static BOOL process_mouse_message( MSG *msg, UINT hw_id, ULONG_PTR extra_info, H
    }
    else
    {
+        HWND orig = msg->hwnd;
+
        msg->hwnd = WINPOS_WindowFromPoint( msg->hwnd, msg->pt, &hittest );
+        if (!msg->hwnd) /* As a heuristic, try the next window if it's the owner of orig */
+        {
+            HWND next = GetWindow( orig, GW_HWNDNEXT );
+
+            if (next && GetWindow( orig, GW_OWNER ) == next && WIN_IsCurrentThread( next ))
+                msg->hwnd = WINPOS_WindowFromPoint( next, msg->pt, &hittest );
+        }
    }

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