Fixed a crash in the input handler caused by invalidated by hot-reload instance trying to unregister a delegate.

CHANGES.md

@@ -5,6 +5,10 @@ Versions marked as 'unofficial' are labelled only for the needs of this changelo
 Change History
 --------------
 
+Version: 1.21 (2020/07)
+Improving stability
+- Fixed a crash in the input handler caused by invalidated by hot-reload instance trying to unregister a delegate.
+
 Version: 1.20 (2020/06)
 Transition to IWYU and maintenance:
 - Replaced includes of monolithic headers.

ImGui.uplugin

@@ -1,7 +1,7 @@
 {
 	"FileVersion": 3,
 	"Version": 1,
-	"VersionName": "1.20",
+	"VersionName": "1.21",
 	"FriendlyName": "ImGui",
 	"Description": "",
 	"Category": "Debug",

README.md

@@ -9,7 +9,7 @@ Dear ImGui is an immediate-mode graphical user interface library that is very li
 
 Status
 ------
-Version: 1.20
+Version: 1.21
 
 ImGui version: 1.74
 

Source/ImGui/Private/ImGuiInputHandler.cpp

@@ -349,7 +349,9 @@ void UImGuiInputHandler::BeginDestroy()
 {
 	Super::BeginDestroy();
 
-	if (ModuleManager)
+	// To catch leftovers from modules shutdown during PIE session.
+	extern FImGuiModuleManager* ImGuiModuleManager;
+	if (ModuleManager && ModuleManager == ImGuiModuleManager)
 	{
 		ModuleManager->GetSettings().OnUseSoftwareCursorChanged.RemoveAll(this);
 	}

Source/ImGui/Private/ImGuiModule.cpp

@@ -31,7 +31,7 @@ struct EDelegateCategory
 	};
 };
 
-static FImGuiModuleManager* ImGuiModuleManager = nullptr;
+FImGuiModuleManager* ImGuiModuleManager = nullptr;
 
 #if WITH_EDITOR
 static FImGuiEditor* ImGuiEditor = nullptr;