Appearance: Only Select() if we are attached to a window.

Otherwise the appropriate message won't be sent.
AttachedToWindow() will take care of selecting
in that case.

Fixes #18891.

src/preferences/appearance/APRView.cpp

@@ -253,7 +253,8 @@ APRView::_CreateItems()
 		fAttrList->AddItem(new ColorWhichItem(text, which, ui_color(which)));
 	}
 
-	fAttrList->Select(0);
+	if (Window() != NULL)
+		fAttrList->Select(0);
 }