Fix the point in time in the frame that we run and render the ImDebugger

Turns out it matters quite a lot. Will see if I can clean this up later.

Common/UI/ScreenManager.cpp

@@ -187,7 +187,7 @@ void ScreenManager::resized() {
 	}
 }
 
-ScreenRenderFlags ScreenManager::render() {
+ScreenRenderFlags ScreenManager::Render(std::function<void()> afterPreRender) {
 	using namespace Draw;
 
 	ScreenRenderFlags flags = ScreenRenderFlags::NONE;
@@ -203,6 +203,8 @@ ScreenRenderFlags ScreenManager::render() {
 		flags |= layer.screen->PreRender(mode);
 	}
 
+	afterPreRender();
+
 	// Now, start the final render pass. This is now the ONLY place where binding the null fb is allowed.
 	draw_->BindFramebufferAsRenderTarget(nullptr, {RPAction::CLEAR, RPAction::CLEAR, RPAction::CLEAR}, "BackBuffer");
 	getUIContext()->BeginFrame();

Common/UI/ScreenManager.h

@@ -47,7 +47,7 @@ public:
 		postRenderUserdata_ = userdata;
 	}
 
-	ScreenRenderFlags render();
+	ScreenRenderFlags Render(std::function<void()> afterPreRender);
 	void resized();
 	void shutdown();