Allow growing of MessageViewController

[BasThomas]

I don’t know if this is a MessageViewController issue or just set to very low in GitHawk? Can we make it more flexible so we can grow it on iPad (especially with a hardware keyboard)?

Bug Report Dump (Auto-generated)

Version 1.18.0 (1519351495)
Device: iPad7,3 (iOS 11.2.6)
TestFlight: true

[rnystrom]

Def! There’s a setting for the max height. Could set that larger if iPad. Maybe the default behavior is a little more advanced (like based on available screen space?).

_{Sent with GitHawk}

[BasThomas]

Yeah, that'd be neat. I would think maybe amount of lines or just a height. The consumer can then calculate whatever height it wants (eg. 30% of available space). MessageViewController can then be responsible to check if a keyboard is up or not?