Pasting text can be slow, can stall repl entirely

[andrewconner]

Pasting text can be very slow. For small amounts, pasting is near instant. However, for several lines, it can take well over 10s. I've managed to stall the process entirely with a paste of <20kb of Scala code.

I haven't been able to isolate if the kind of text really matters, but here are some data points:

1. First chapter of Alice in Wonderland (11kb) into a multiline string takes over 10s. Gif.
2. <1kb Scala object (HofstadterConway.scala) takes over 17s. Gif

Ammonite Repl 0.5.0
Scala 2.11.7
Java 1.8.0_25
2.7 GHz Intel Core i7 MacBook Pro, 16gb RAM

[andrewconner]

Verified, fixed in 0.5.1.