Misc: Stop moving window if mouse position becomes invalid. Flagged menus are _NoMove for sanity.

imgui.cpp

@@ -3272,13 +3272,13 @@ static void ImGui::UpdateMovingWindow()
         KeepAliveID(g.ActiveId);
         IM_ASSERT(g.MovingWindow && g.MovingWindow->RootWindow);
         ImGuiWindow* moving_window = g.MovingWindow->RootWindow;
-        if (g.IO.MouseDown[0])
+        if (g.IO.MouseDown[0] && IsMousePosValid(&g.IO.MousePos))
         {
             ImVec2 pos = g.IO.MousePos - g.ActiveIdClickOffset;
             if (moving_window->Pos.x != pos.x || moving_window->Pos.y != pos.y)
             {
                 MarkIniSettingsDirty(moving_window);
-                moving_window->Pos = pos;
+                SetWindowPos(moving_window, pos, ImGuiCond_Always);
             }
             FocusWindow(g.MovingWindow);
         }
@@ -11381,7 +11381,7 @@ bool ImGui::BeginMenu(const char* label, bool enabled)
     {
         // Sub-menus are ChildWindow so that mouse can be hovering across them (otherwise top-most popup menu would steal focus and not allow hovering on parent menu)
         SetNextWindowPos(popup_pos, ImGuiCond_Always);
-        ImGuiWindowFlags flags = ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings | ((window->Flags & (ImGuiWindowFlags_Popup|ImGuiWindowFlags_ChildMenu)) ? ImGuiWindowFlags_ChildMenu|ImGuiWindowFlags_ChildWindow : ImGuiWindowFlags_ChildMenu);
+        ImGuiWindowFlags flags = ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings | ((window->Flags & (ImGuiWindowFlags_Popup|ImGuiWindowFlags_ChildMenu)) ? ImGuiWindowFlags_ChildMenu|ImGuiWindowFlags_ChildWindow : ImGuiWindowFlags_ChildMenu);
         menu_is_open = BeginPopupEx(id, flags); // menu_is_open can be 'false' when the popup is completely clipped (e.g. zero size display)
     }