Unreal Engine Issues and Bug Tracker (UE-42935)

Description

When adding/removing pins on a Switch on Gameplay Tag Container node, it can cause a crash. There are multiple ways to get this to happen when deleting pins, the order given in the reproduction steps is just guaranteed.

Regression?: No
This also occurred in 4.14

User descriptions:

Crashes when i'm trying to edit Switch on gameplay tag container
Switch on Gameplay tag container, adding elements in the panel does not always add pins. And then removind the elements or unused pins caushed this crash.
Please troubleshoot the switch on gamplay tag container, it has many problems such as:
-Adding a pin by clicking the + in the details panel does not add a pin to the blueprint.
-Right clicking a pin on the blueprint and deleting it, will not delete it from the details panel. And clicking the delete in the details panel caused this crash.
Also a feature request: instead of showing "case n" on the switch blueprint, show the actual tags.
Gameplay tag containers are awesome.

Steps to Reproduce

Open a level blueprint
Add a "Switch on Gameplay Tag Container" node
On the node itself, use the "Add Pin" button to add two pins
In the details panel, use the + button to add 3 more pins (Note that these pins do not show up on the node)
In the details panel, delete pins in the following order: #1, #2, #2, #1
Result: When deleting pins, the editor will crash
Expected: The pins are deleted successfully without a crash

Callstack

UE4Editor_GameplayTagsEditor!UGameplayTagsK2Node_SwitchGameplayTagContainer::CreateCasePins() [gameplaytagsk2node_switchgameplaytagcontainer.cpp:125]
UE4Editor_BlueprintGraph!UK2Node::ReallocatePinsDuringReconstruction() [k2node.cpp:361]
UE4Editor_BlueprintGraph!UK2Node::ReconstructNode() [k2node.cpp:463]
UE4Editor_GameplayTagsEditor!UGameplayTagsK2Node_SwitchGameplayTagContainer::PostEditChangeProperty() [gameplaytagsk2node_switchgameplaytagcontainer.cpp:63]
UE4Editor_CoreUObject!UObject::PostEditChangeChainProperty() [obj.cpp:421]
UE4Editor_PropertyEditor!FPropertyNode::NotifyPostChange() [propertynode.cpp:2368]
UE4Editor_PropertyEditor!FPropertyValueImpl::ClearChildren() [propertyhandleimpl.cpp:1431]
UE4Editor_PropertyEditor!FPropertyHandleArray::EmptyArray() [propertyhandleimpl.cpp:3616]
UE4Editor_PropertyEditor!FPropertyEditor::OnEmptyArray() [propertyeditor.cpp:388]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,FPropertyEditor,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,FPropertyEditor,0,void __cdecl() [delegateinstancesimpl.h:433]
UE4Editor_PropertyEditor!SDetailsViewBase::Tick() [sdetailsviewbase.cpp:1095]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:776]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:21]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_Slate!SBox::OnPaint() [sbox.cpp:237]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:21]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_Slate!SBorder::OnPaint() [sborder.cpp:86]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:21]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_Slate!SBorder::OnPaint() [sborder.cpp:86]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SOverlay::OnPaint() [soverlay.cpp:102]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:21]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_Slate!SSplitter::OnPaint() [ssplitter.cpp:167]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SOverlay::OnPaint() [soverlay.cpp:102]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:21]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_Slate!SBorder::OnPaint() [sborder.cpp:86]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SOverlay::OnPaint() [soverlay.cpp:102]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:21]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:37]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:46]
UE4Editor_Slate!SSplitter::OnPaint() [ssplitter.cpp:167]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:779]

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Fixed

Component	UE - Gameplay - Blueprint Editor
Affects Versions	4.13, 4.14, 4.15, 4.16
Target Fix	4.16

Fix Commit	3348502
Main Commit	3358685

Created	Mar 15, 2017
Resolved	Mar 15, 2017
Updated	Jul 27, 2018

UE-42935

[CrashReport] Deleting pins on Switch on Gameplay Tag Container node can cause a crash

[CrashReport] Deleting pins on Switch on Gameplay Tag Container node can cause a crash

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