Handle multiline input in GHCi history
GHCi accepts multiline input in the form of:
Prelude> :{
Prelude| let f = do
Prelude| print "Hello"
Prelude| print "World"
Prelude| :}
OR of the form:
Prelude> :set +m
Prelude| let f = do
Prelude| print "Hello"
Prelude| print "World"
Prelude|
Prelude>
However, recalling mulitline input from history (with the <Up> key or <C-p>) recalls it as its individual lines, not the whole input. Ideally multiline should be one history entry and allow proper editing of the recalled text.