Handling startpos == endpos (a.k.a an empty selection, not 0)

[norcalli]

If you highlight the left bracket in hello [] and type ci[, the inside of the brackets will be selected to start replacing which is the default text object. As far as I can tell, there is no way of indicating this behavior using the plugin. Is there something I missed, or should I look to try to modify textobj-user, and if so, do you have a suggestion where to start?

[kana]

There is no way to target an empty region in Vim script, as far as I know. So that you have to make a patch to Vim to provide this functionality before tweaking vim-textobj-user.

[kana]

Additionally, if you specify the same position for both start and end positions, it means a region which consists of only one character, not an empty region.

[kana]

Theoretically, it seems to be possible to target an empty region by selecting a character in Visual mode with 'selection' = exclusive. But Vim behaves as if this selection is inclusive, so that it targets the character instead of an empty region. This behavior is inconsistent with the description of :help 'selection'. It might be a bug, but it might be an intentional behavior for backward compatibility.