avoid not to truncate necessary chars

[rchaser53]

fix: #3636

[scampi]

Thanks for giving this issue a try!

While this does resolve the problem, I think this is a hack around the actual problem: sometimes the last statement in the block has an extra indentation which needs then to be truncated. This is mentioned in the FIXME, and we could profit with this issue to resolve it!

I think the best would be to resolve this, that there is not trailing indent, and therefore we could remove the truncate logic from close_block.

[rchaser53]

This issue priority is high, so I think this issue should be fixed as soon as possible.
I propose that merge this PR as a temporary fix, and will fix correctly after.

I tried to remove the truncate logic from close_block. But close_block affected range is very large.
This method affect not only end of the block but also other block statements indent.

If this issue can be resolved easily, please send PR instead of me.
It take a time for me to resolve correctly. :-(

[scampi]

I propose that merge this PR as a temporary fix, and will fix correctly after.

Sounds good to me!

[topecongiro]

Merging this, thank you @rchaser53!