System: Invalidate display on debug window change

Fixes these windows displaying black if the VM is paused.

src/core/imgui_overlays.cpp

@@ -203,10 +203,11 @@ void Host::DisplayLoadingScreen(const char* message, int progress_min /*= -1*/,
   ImGui::NewFrame();
 }
 
-void ImGuiManager::UpdateDebugWindowConfig()
+bool ImGuiManager::UpdateDebugWindowConfig()
 {
 #ifndef __ANDROID__
   const bool block_all = Achievements::IsHardcoreModeActive();
+  bool was_changed = false;
 
   for (size_t i = 0; i < NUM_DEBUG_WINDOWS; i++)
   {
@@ -230,8 +231,16 @@ void ImGuiManager::UpdateDebugWindowConfig()
       {
         ERROR_LOG("Failed to create aux render window for {}: {}", info.name, error.GetDescription());
       }
+      else
+      {
+        was_changed = true;
       }
     }
+  }
+
+  return was_changed;
+#else
+  return false;
 #endif
 }
 

src/core/imgui_overlays.h

@@ -10,7 +10,7 @@
 namespace ImGuiManager {
 void RenderTextOverlays();
 void RenderDebugWindows();
-void UpdateDebugWindowConfig();
+bool UpdateDebugWindowConfig();
 void DestroyAllDebugWindows();
 
 void RenderOverlayWindows();

src/core/system.cpp

@@ -1298,7 +1298,10 @@ bool System::RecreateGPU(GPURenderer renderer, bool force_recreate_device, bool
   }
 
   if (force_recreate_device)
+  {
     ImGuiManager::UpdateDebugWindowConfig();
+    InvalidateDisplay();
+  }
 
   // fix up vsync etc
   UpdateSpeedLimiterState();
@@ -4596,7 +4599,8 @@ void System::CheckForSettingsChanges(const Settings& old_settings)
 
     PostProcessing::UpdateSettings();
 
-    ImGuiManager::UpdateDebugWindowConfig();
+    if (ImGuiManager::UpdateDebugWindowConfig())
+      InvalidateDisplay();
 
 #ifdef ENABLE_GDB_SERVER
     if (g_settings.debugging.enable_gdb_server != old_settings.debugging.enable_gdb_server ||