Problem: Visual block insertion does not insert in all lines.
Solution: Don't bail out of insert too early. Add a test. (Christian
Brabandt, closes#1290)
Problem: Pasting inserted text in Visual mode does not work properly.
(Matthew Malcomson)
Solution: Stop Visual mode before stuffing the inserted text. (Christian
Brabandt, from neovim #5709)
Problem: Using the system default encoding makes tests unpredictable.
Solution: Always use utf-8 or latin1 in the new style tests. Remove setting
encoding and scriptencoding where it is not needed.
