Make counted p more usable

[lichray]

Contributed by Walter Alejandro Iglesias [email protected]

An implementation detail of p with a count made it not as usable as P. Users have to switch to P with a count to get sensible content. The patch solves the issue by factoring the cursor placement out of p/P with a count. After the change, p also collects content without interleaving.

To illustrate how bizarre the current behavior is, consider this example:

First,
v Put the cursor here, yank "Hello" with 'ye'
    v Move the cursor to 'o' and paste with '2p'
Hello
v And then, open a new line and paste with '2p' again

After the first operation, you will get

HelloHHelloello
     ^ where the cursor lands on the first 'H'

After the second operation, you will get

HHelloello
 ^ but this time the cursor lands on the second 'H'

This means if you use 3p instead of 2p to repeat the example, the content to paste with the two operations (with or without starting on an empty line) will diverge. You end up with

HelloHHelloHelloello
     ^ and
HHHelloelloello
 ^ respectively.

This also affects line-based p with a count.

The proposed change produces

HelloHelloHelloHello
     ^ and
HelloHelloHello
^

Closes: #146