enhance entering, exiting, and copying in copy mode

[BrettKulp]

This is where I ended up with #50

add ctrl + w j/k for entering and exiting copy mode without scrolling the chat history. The cursor will enter into a row that is already visible in the chat history if the chat is scrolled up to previous older messages. Leader + v, esc, and q still scroll chat history while entering and exiting as before.

add yy for yanking a whole line in copy mode while not in VL mode

add i going directly into insert mode in the input prompt without scrolling the chat history

make it so y in copy mode stays in copy mode rather than scrolls the chat history to the bottom

Entering and exiting copy mode via ctr + w + j/k if will enter into a visible section of chat history

I like these changes because they feel more like vim to me but if you don't want to force them onto users I understand

[leohenon]

Thanks! Would you mind splitting copy mode yy into its own PR?

[BrettKulp]

I sent the yy pr #82 did you want me to make a new pr with these changes that does not include yy?

[leohenon]

Yes please, remove the yy changes from this branch. The two yy implementations are different, and the one in
#82 is cleaner because it doesn’t reuse visual line mode for the flash.

[leohenon]

Thanks. Can you explain why both skipExitOnModeChange and exitScrollToBottom are needed? I want to make sure I understand the exit flow, what path would break if we removed one of them?

[BrettKulp]

exitScrollToBottom was redundant. I removed it but I just noticed some flashing on long chats that is happening

[BrettKulp]

I will reopen this when I fix the flashing. It is turning out to be harder to fix than I expected