Add callback PostRenderDockableWindows

src/hello_imgui/internal/backend_impls/abstract_runner.cpp

@@ -834,6 +834,9 @@ void AbstractRunner::RenderGui()
 
     Theme_WindowGui(params.imGuiWindowParams.tweakedTheme);
 
+    if (params.callbacks.PostRenderDockableWindows)
+        params.callbacks.PostRenderDockableWindows();
+
     DockingDetails::CloseWindowOrDock(params.imGuiWindowParams);
 }
 

src/hello_imgui/runner_callbacks.h

@@ -131,6 +131,7 @@ struct RunnerCallbacks
     // --------------- GUI Callbacks -------------------
 
     // `ShowGui`: Fill it with a function that will add your widgets.
+    // (ShowGui will be called at each frame, before rendering the Dockable windows, if any)
     VoidFunction ShowGui = EmptyVoidFunction();
 
     // `ShowMenus`: Fill it with a function that will add ImGui menus by calling:
@@ -250,6 +251,10 @@ struct RunnerCallbacks
     //  on top of that content.
     VoidFunction CustomBackground = EmptyVoidFunction();
 
+    // `PostRenderDockableWindows`: Fill it with a function that will be called
+    // after the dockable windows are rendered.
+    VoidFunction PostRenderDockableWindows = EmptyVoidFunction();
+
     // `AnyBackendEventCallback`:
     //  Callbacks for events from a specific backend. _Only implemented for SDL.
     //  where the event will be of type 'SDL_Event *'_