Altscreen enter and exit messages

[meowgorithm]

Right now the only way to enter and exit the altscreen (full window mode) is via Program.EnterAltScreen() and Program.ExitAltScreen(). This means that, without employing hacks, one can only enter and exit when starting and quitting programs. It probably makes sense to have library-level commands, similar to tea.Quit, for entering and exiting the altscreen to give Bubble Tea programs the opportunity to jump in and out of the altscreen in-program.

[kiyonlin]

This is a good idea. So we should provide 2 Msg tea.EnterAltScreen and tea.ExitAltScreen. User can trigger them in Update if they want to change the alt screen mode.

I think I can submit a PR if you haven't done this.

[meowgorithm]

That would be awesome, @kiyonlin. Please do feel free to submit a PR. I’d probably call them tea.EnterAltScreenMsg and tea.ExitAltScreenMsg for naming consistency (like tea.KeyMsg and tea.WindowSizeMsg).

[meowgorithm]

Actually, @kiyonlin, there’s a branch I should merge before you do this. I’ll do that in a few minutes and let you know when it’s in.

[kiyonlin]

Dw, I will do it tomorrow (9 hours later) 😃

[meowgorithm]

@kiyonlin Alright, go for it. There are some small changes in how the alt screen is set in #61 (just merged) but it shouldn't change your implementation.

[meowgorithm]

Oh, just one more thought: realizing we'll also need two commands in addition to messages which I'd probably call tea.EnterAltScreen and tea.ExitAltScreen.

[meowgorithm]

This has been merged and was released in v0.13.0.