Viewports: clear ImGuiViewportFlags_NoFocusOnAppearing for modals.

Honestly I'm not sure about side-effects but intuitively not needed. Dragging windows will still forcefully set this.
Fixes e.g. appearing modal not taking focus = in win32 implementation it stops task bar icons from appearing (which is to be investigated).

backends/imgui_impl_win32.cpp

@@ -1258,6 +1258,7 @@ static void ImGui_ImplWin32_ShowWindow(ImGuiViewport* viewport)
         ::ShowWindow(vd->Hwnd, SW_SHOW);
 
     // Restore
+    // FIXME: Note that setting parent also disable task bar icon, which is sort of unexpected and both params are picked separately.
     if (avoid_bringing_parent_to_front)
         ::SetWindowLongPtr(vd->Hwnd, GWLP_HWNDPARENT, (LONG_PTR)vd->HwndParent);
 }

docs/CHANGELOG.txt

@@ -102,6 +102,13 @@ Other Changes:
   Made the script detect the environment when needed (e.g. to specify library path).
 - Examples: added support for ARM64 in selected build_win.bat helpers. (#9593) [@Harishmcw]
 
+Docking+Viewports Branch:
+
+- Viewports:
+  - Fixed an issue where in some code paths, a newly created modal in its own
+    viewport would be created with `ImGuiViewportFlags_NoFocusOnAppearing`.
+    On some backends this would prevent the task bar icon from showing.
+
 
 -----------------------------------------------------------------------
  VERSION 1.93.0 (Released 2026-10-14)

imgui.cpp

@@ -17501,6 +17501,8 @@ ImGuiViewportP* ImGui::AddUpdateViewport(ImGuiWindow* window, ImGuiID id, const
         const bool window_can_use_inputs = ((window->Flags & ImGuiWindowFlags_NoMouseInputs) && (window->Flags & ImGuiWindowFlags_NoNavInputs)) == false;
         if (g.MovingWindow && g.MovingWindow->RootWindowDockTree == window)
             flags |= ImGuiViewportFlags_NoInputs | ImGuiViewportFlags_NoFocusOnAppearing;
+        else if (window->Flags & ImGuiWindowFlags_Modal)
+            flags &= ~ImGuiViewportFlags_NoFocusOnAppearing;
         if (!window_can_use_inputs)
             flags |= ImGuiViewportFlags_NoInputs;
         if (window->Flags & ImGuiWindowFlags_NoFocusOnAppearing)