reduce padding for virtual lines

[Beastwick18]

Hello, this PR reduces the padding of virtual lines so that lines with multiple formulas or text following formulas so they are more condensed.

Before:

After:

I'm fairly inexperienced with lua, so the code may have a better possible implementation.

[max397574]

1. squash commits
2. couldn't you just remove empty strings or whitespace from the beginning and end of the table?
   or perhaps just add one whitespace of padding

[Beastwick18]

Sorry about all the commits, for some reason I'm unable to squash them without errors.

I'm not quite sure what you mean by the second part. The way I thought it was working was that the whitespace was appended onto the above and below virt lines, and then they were merged into one line.

Also, yes, one whitespace of padding could be added back.

[max397574]

oh I see
didn't really look at the code for the second part but it makes sense what you're saying
I thought there was a much simpler solution then what you did but there isn't

also what kind of errors do you get when trying to squash?

[Beastwick18]

I'm trying to squash on GitHub Desktop, but it says

Unable to squash. Squashing replays all commits up to the last one required for the squash. A merge commit cannot exist among those commits

I think it might be because I should have squashed them before pushing to remote?

[max397574]

the error messages says that there is a problem because of the merge commit
perhaps squash all the other ones then

after all this doesn't matter because there likely will be a squash merge or a merge commit only anyway but it just makes the pr look nicer

[Beastwick18]

For some reason I get the same error no matter the combination of commits I try to squash. If you'd like I could open another PR with a branch that has few commits.

[Beastwick18]

Ok just figured out the squash issue, should be good now.

[jbyuki]

All the tests pass, merging.
Thanks!