tor-browser

commit 8c456fb7974bb0a62dd2f542030646f1fe957095
parent 25fe7c42713b9f44af75864e94362ad7463ed78b
Author: Emilio Cobos Álvarez <emilio@crisal.io>
Date:   Mon,  8 Dec 2025 15:01:20 +0000

Bug 1994918 - Bypass windows app sdk handling of WM_NCLBUTTONDBLCLK. r=gstoll,win-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D275358

Diffstat:
M
widget/windows/nsWindow.cpp
 | 
7
+++++++

1 file changed, 7 insertions(+), 0 deletions(-)
diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
@@ -5534,6 +5534,13 @@ bool nsWindow::ProcessMessageInternal(UINT msg, WPARAM& wParam, LPARAM& lParam,
       result = DispatchMouseEvent(eMouseUp, 0, lParamToClient(lParam), false,
                                   MouseButton::ePrimary, MOUSE_INPUT_SOURCE());
       DispatchPendingEvents();
+      // DefWindowProc handles vertical expansion, but the Windows App SDK
+      // breaks it, see bug 1994918. So bypass the app sdk by calling into the
+      // default proc here.
+      if (!result) {
+        *aRetValue = DefWindowProcW(mWnd, msg, wParam, lParam);
+        result = true;
+      }
       break;
 
     case WM_NCLBUTTONDOWN: {