Add support for max_preview_height setting

[RichardDRJ]

This allows for more configuration around show_preview, specifically in the case where someone has shell commands spanning more than 4 lines in their history and need to differentiate between them with something other than the first few lines.

This change makes the following supporting changes:

• Update the preview renderer to split lines when they go past the preview width, rather than splitting the whole string - this means that the preview is cleanly rendered even in cases where there are newlines
• Update the preview height size calculator to take into account existing newlines

A couple of other notes here:

• I've never written rust before, so very open to being told I've done something iffy here
• I think this strips out empty lines from the preview - I'm not sure the best way to fix it given my lack of Rust experience, but given that any more than 4 lines was cut off before, I'm not sure there'll be any visible regression

Screenshots

style = "compact"
show_preview = true
max_preview_height = 6

Short command with longer commands in history

Long command, longer than 4 lines but shorter than max_preview_height

Longest command in history, longer than max_preview_height

---

style = "full"
show_preview = true
max_preview_height = 6

Short command with longer commands in history

Long command, longer than 4 lines but shorter than max_preview_height

Longest command in history, longer than max_preview_height

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Name	Status	Preview	Comments	Updated (UTC)
atuin	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 6, 2023 8:49am

[ellie]

This makes sense and is a nice improvement, thank you!

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[ellie]

Looks like it needs a cargo fmt! Should be good otherwise

[RichardDRJ]

Oops, thanks @ellie! Have addressed and pushed - hopefully it's all good 😄