Add fragmentLinePadding for multiline shadow view to track TextView correctly #1332
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Summary
Shadow views are used to calculate the container's size using NSTextContainer + NSLayoutManager + NSTextStorage according to https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/TextLayout/Tasks/StringHeight.html.
However, when typing certain text, the TextView itself overflows, but its container doesn't.
This means our shadow view isn't tracking the TextView correctly.
Root cause was that we added a 1px lineFragmentPadding in #640, but we didn't add the save padding in our shadow view.
Changelog
[macOS] [Fixed] - Add fragmentLinePadding for multiline shadow view to track TextView correctly
Test Plan
Before
b.mov
After
a.mov