Fix uncommenting with irregular white spaces.

[chaoren]

Allow stripping white spaces on the left and right independently.
Also, make sure the stripping is not reverted by subsequent lines
which do have white spaces.

The following cases were broken and is now fixed:

Before this change:

1. ^//foo$    -> ^oo$
   ^// bar$      ^bar$
2. ^/*foo */$ -> ^foo $
3. ^/* foo*/$ -> ^/* /1* foo*/ */$

After this change:

1. ^//foo$    -> ^foo$
   ^// bar$      ^ bar$
2. ^/*foo */$ -> ^foo$
3. ^/* foo*/$ -> ^foo$

[chaoren]

Ping? The above issues are still present.

[tpope]

I think the correct behavior for 1 should be

^foo$
^ bar$

Otherwise, you end up munging

//if (condition)
//  action();

[chaoren]

Yes, of course. The patch does the right thing though, I just edited the message incorrectly, since it's been a while.

[chaoren]

Ping.

[chaoren]

Thanks!