[PATCH 0/1] MR2880: win32u: Propagate WM_MOUSEHWHEEL to the parent window in DefWindowProc().

[Brendan Shanks (＠bshanks)]

This enables horizontal scrolling gestures/wheels (tested on macOS) in applications like IrfanView which handle WM_MOUSEHWHEEL.
Support will need to be added to common controls for horizontal scrolling to work in programs like Wine's explorer or regedit.

[PATCH 1/1] win32u: Propagate WM_MOUSEHWHEEL to the parent window in DefWindowProc().

[Brendan Shanks]

From: Brendan Shanks

---
 dlls/win32u/defwnd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/defwnd.c b/dlls/win32u/defwnd.c
index 0635bd2b722..e5ff1a010b9 100644
--- a/dlls/win32u/defwnd.c
+++ b/dlls/win32u/defwnd.c
@@ -2562,8 +2562,9 @@ LRESULT default_window_proc( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam,
         break;

case WM_MOUSEWHEEL:
+    case WM_MOUSEHWHEEL:
         if (get_window_long( hwnd, GWL_STYLE ) & WS_CHILD)
-            result = send_message( get_parent( hwnd ), WM_MOUSEWHEEL, wparam, lparam );
+            result = send_message( get_parent( hwnd ), msg, wparam, lparam );
         break;

case WM_ERASEBKGND: