UI: Display dock-relevant context menu on titlebar

UI/window-basic-main.cpp

@@ -9930,11 +9930,25 @@ void OBSBasic::on_customContextMenuRequested(const QPoint &pos)
 {
 	QWidget *widget = childAt(pos);
 	const char *className = nullptr;
-	if (widget != nullptr)
+	QString objName;
+	if (widget != nullptr) {
 		className = widget->metaObject()->className();
-
-	if (!className || strstr(className, "Dock") != nullptr)
-		ui->menuDocks->exec(mapToGlobal(pos));
+		objName = widget->objectName();
+	}
+
+	QPoint globalPos = mapToGlobal(pos);
+	if (className && strstr(className, "Dock") != nullptr &&
+	    !objName.isEmpty()) {
+		if (objName.compare("scenesDock") == 0) {
+			ui->scenes->customContextMenuRequested(globalPos);
+		} else if (objName.compare("sourcesDock") == 0) {
+			ui->sources->customContextMenuRequested(globalPos);
+		} else if (objName.compare("mixerDock") == 0) {
+			StackedMixerAreaContextMenuRequested();
+		}
+	} else if (!className) {
+		ui->menuDocks->exec(globalPos);
+	}
 }
 
 void OBSBasic::UpdateProjectorHideCursor()