vis: change semantics of operator implementation return value

The return value of operator implementations denoting the new
cursor position is interpreted in the following way:

 - EPOS dispose the cursor
 - [0, text_size] place the cursor accordingly
 - otherwise i.e. > text_size keep the cursor position unchanged

The newly introduced last case is useful for operators which
are called from visual mode, but do not want to change the current
selection.

0 files changed, 0 insertions, 0 deletions