Fix multiline support (updated)

[jon-v2]

No description provided.

[daretodave]

• when we scroll back to the prior command that was broken up -> we are in a single-line mode again
  • im okay with this, but i wonder is there any quick fix to make it scroll back up to make it break up again
    • steps to repro: run a multi-line arg, then hit up to go back to it
• when we shift enter in an existing single line, we break at the end vs. where the cursor is
  • im okay with this too. but i wonder if there is any quick fix to separate at cursor and move the right chunk to the multi-line
    • steps to repo: write test --this --command without any shift enter, then move the cursor to after test and hit shift enter -> there is no break as expected
• when we go up and down history we see the existing multiline arg from the prior attempt, this should clear
• remove justify-content: space-around to get our input to center vertically, that was my bad from the original implementation

[daretodave]

this is 🔥 🔥 🔥 🔥 🔥 🔥 lets just get the third and forth one addressed at least, other two can wait for future

[daretodave]

see above