Fixed clicking on a window's void while staying still overzealously marking .ini settings as dirty (#923)

imgui.cpp

@@ -2220,7 +2220,7 @@ void ImGui::NewFrame()
             if (!(g.MovedWindow->Flags & ImGuiWindowFlags_NoMove))
             {
                 g.MovedWindow->PosFloat += g.IO.MouseDelta;
-                if (!(g.MovedWindow->Flags & ImGuiWindowFlags_NoSavedSettings))
+                if (!(g.MovedWindow->Flags & ImGuiWindowFlags_NoSavedSettings) && (g.IO.MouseDelta.x != 0.0f || g.IO.MouseDelta.y != 0.0f))
                     MarkSettingsDirty();
             }
             FocusWindow(g.MovedWindow);