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-rw-r--r--src/window.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/window.cpp b/src/window.cpp
index 61ef20bef..fd6ce0900 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -446,7 +446,7 @@ static void DispatchMouseWheelEvent(Window *w, const NWidgetCore *nwid, int whee
/* Using wheel on caption/shade-box shades or unshades the window. */
if (nwid->type == WWT_CAPTION || nwid->type == WWT_SHADEBOX) {
- w->SetShaded(!w->IsShaded());
+ w->SetShaded(wheel < 0);
return;
}