#5953 Fix for conversation animation when keyboard is shown

[armartinez]

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• iPhone 16 Pro, iOS 18.3.2

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Description

This fixes issue #5953 when opening the keyboard on a conversation. What is happening is that items that will be pushed out of the frame are removed before the system animation begins so when it starts they are faded out as removed items. With this fix, those elements are added to the animation queue so they are present when the animation beings.

Before :

before.mov

After:

after.mov

I added a new parameter to the signature of the updateContentInset function for the animation duration with a default value of the inherited duration temporarily. The final implementation should contemplate updating the InputAccessoryViewPlaceholderDelegate protocol, adding the animation duration argument to the methods inputAccessoryPlaceholderKeyboardDidPresent and inputAccessoryPlaceholderKeyboardDidDismiss functions in order to pass that value to the updateContentInset method. I avoided this in order to keep this PR short and have room for discussion.