REPL 'last change' time-stamp should be taken from start of reload

[edwinb]

Issue by ohad
Friday Oct 18, 2019 at 12:17 GMT
Originally opened as edwinb/Idris2-boot#127

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Steps to Reproduce

Take a file that takes idris2 a while to type-check, say Foo.idr.
While idris2 is type-checking, make a change in the file and save before idris2 finishes.
Reload the file.

Expected Behavior

Main> :r
1/1 Building Main (Foo.idr)
Main> 

Observed Behavior

Main> :r
Main> 

I think this is because the timestamp on the last change to this file is taken after type-checking finishes, and it should be taken before type-checking starts.