preserve text formatting

[selfint]

No description provided.

[selfint]

Figure out how to handle "double newline".

When a block appears right after a newline, a redundant newline is inserted between the actual newline, and the one created by
the block. Maybe just checking if the previous byte is a newline, and if so removing it, is good enough?

[selfint]

Trimming whitespace seems to work.

Another problem, when we preserve text whitespace, indentation is all wrong due to margins/padding. Maybe disabling them, and adding the previous whitespace of each Tree, to the Tree, will work?

[selfint]

Maybe boxes aren't the way to go here?

Can we just copy how the text appears in the real file, and draw boxes dynamically around relevant parts?

For example:

+--------+-------------------+-+
| export | function foo() {} | |
+--------+-------------------+-+