Fix iOS 16 UITextView intrinsicContentSize bug

[mpospese]

Introduction

Using latest Xcode 14 beta, unit tests for TypographyTextView would fail when targeting iOS 16.

Purpose

Fix our text view so that it sizes itself properly (as a multiple of line height) under iOS 16

Scope

• iOS 16-only change to TypographyTextView
• slight change to a unit test

Discussion

Starting with iOS 16, UITextView uses TextKit 2 text layout manager to render text view content. For whatever reason, when rendered in this manner the text view's intrinsic content size does not reflect the number of lines despite our use of attributed text attributes to set line height. However, there is a work around to get the text view to render using the legacy TextKit 1 layout manager. Using the original layout manager the text view's have the expected intrinsic content size.

📈 Coverage

Code

99.3% when testing iOS 15, 100% when testing iOS 16
(because there's a line of code that only runs on iOS 16)

Documentation

100%