MultiSelect: mark parent child window as navigable into, with highlight. Assume user will always submit interactive items.

imgui_demo.cpp

@@ -3211,6 +3211,7 @@ static void ShowDemoWindowMultiSelect()
             ImGui::BulletText("Shift+Click to check multiple boxes.");
             ImGui::BulletText("Shift+Keyboard to copy current value to other boxes.");
 
+            // If you have an array of checkboxes, you may want to use NoAutoSelect + NoAutoClear and the ImGuiSelectionExternalStorage helper.
             static bool values[20] = {};
             static ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_NoAutoSelect | ImGuiMultiSelectFlags_NoAutoClear | ImGuiMultiSelectFlags_ClearOnEscape;
             ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoAutoSelect", &flags, ImGuiMultiSelectFlags_NoAutoSelect);

imgui_widgets.cpp

@@ -7329,6 +7329,8 @@ ImGuiMultiSelectIO* ImGui::BeginMultiSelect(ImGuiMultiSelectFlags flags, int cur
     ms->BackupCursorMaxPos = window->DC.CursorMaxPos;
     ms->ScopeRectMin = window->DC.CursorMaxPos = window->DC.CursorPos;
     PushFocusScope(ms->FocusScopeId);
+    if (flags & ImGuiMultiSelectFlags_ScopeWindow) // Mark parent child window as navigable into, with highlight. Assume user will always submit interactive items.
+        window->DC.NavLayersActiveMask |= 1 << ImGuiNavLayer_Main;
 
     // Use copy of keyboard mods at the time of the request, otherwise we would requires mods to be held for an extra frame.
     ms->KeyMods = g.NavJustMovedToId ? g.NavJustMovedToKeyMods : g.IO.KeyMods;