remakeConstraints will crash

[dark155]

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Issue Info

Info	Value
Platform	e.g. ios/osx/tvos
Platform Version	e.g. 8.0
SnapKit Version	e.g. 0.19.0
Integration Method	e.g. carthage/cocoapods/manually

Issue Description

Crashed: com.apple.main-thread
0 CoreAutoLayout 0x6404 AddVarToSortedPriorityVectorList + 68
1 CoreAutoLayout 0x10020 -[NSISObjectiveLinearExpression addVar:priority:times:processVarNewToReceiver:processVarDroppedFromReceiver:] + 240
2 CoreAutoLayout 0x10690 NSISLinExpEnumerateVarsAndCoefficients + 92
3 CoreAutoLayout 0xf720 -[NSISObjectiveLinearExpression addExpression:priority:times:processVarNewToReceiver:processVarDroppedFromReceiver:] + 144
4 CoreAutoLayout 0x8db8 -[NSISEngine tryUsingArtificialVariableToAddConstraintWithMarker:row:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] + 204
5 CoreAutoLayout 0xd96c -[NSISEngine _tryToAddConstraintWithMarkerEngineVar:row:mutuallyExclusiveConstraints:] + 388
6 CoreAutoLayout 0x7f7c -[NSISEngine tryToAddConstraintWithMarker:expression:mutuallyExclusiveConstraints:] + 668
7 CoreAutoLayout 0x7be4 -[NSLayoutConstraint _addLoweredExpression:toEngine:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:] + 232
8 CoreAutoLayout 0x21e8 -[NSLayoutConstraint _addToEngine:mutuallyExclusiveConstraints:] + 148
9 UIKitCore 0x56838 -[UIView _layoutEngine_didAddLayoutConstraint:roundingAdjustment:mutuallyExclusiveConstraints:] + 520
10 UIKitCore 0x3bb80 -[UIView _tryToAddConstraint:roundingAdjustment:mutuallyExclusiveConstraints:] + 156
11 UIKitCore 0x585d8 -[UIView(UIConstraintBasedLayout) nsli_addConstraint:] + 72
12 CoreAutoLayout 0x6304 __55+[NSLayoutConstraint _addOrRemoveConstraints:activate:]_block_invoke + 36
13 CoreAutoLayout 0x55d8 -[NSISEngine withBehaviors:performModifications:] + 76
14 CoreAutoLayout 0x23cc +[NSLayoutConstraint _addOrRemoveConstraints:activate:] + 264
15 mxz_ios 0xde0cc4 specialized static ConstraintMaker.makeConstraints(item:closure:) + 4384869572

[Rex-xingjl]

I have the same crash and still work on it. It seems when I remake constraints for ViewA, but I don't remake constraints for ViewA's subviews.
The reason for this crash is that I animate the presentation of a view and use SnapKit for constraint changes during the process.