There was a UI bug in the StatusChatInput where, only in the timeline view,
the scrollview wrapping the textarea would have a weird behaviour in which
it would render the visible text(placeholder) *lower* than how it's actually
positioned. Once the textarea is clicked, it would re-adjust with a smooth
scroll.
Obviously this is undesired behaviour as the text should always render in the
correct position.
This commit finally fixes this weird behaviour by moving the dynamic height
calculation to the wrapping Rectangle and changing the textarea's top- and
bottom paddings dynamically.
Fixes#2018
42e3444731