Mention should not add a white space if a position already followed by one

[oleq]

For instance the following:

foo @ bar

Should result in

foo @completed bar

Instead of

double space now-------v
        foo @completed  bar

[oleq]

This makes even more sense since https://github.com/ckeditor/ckeditor5-mention/issues/44 brings support for typing in brackets and quotes. For instance ATM you have to remove a white space after the mention if you want to type "@foo":

type("):     "
type(@):    "@
select:     "@foo // there's a whitespace at the end
backspace:  "@foo // no whitespace after
type("):    "@foo"

Expected

type("):     "
type(@):    "@
select:     "@foo // no whitespace at the end
type("):    "@foo"

[jodator]

ATM we only analyze the text before the selection but the check for a whitespace after the inserted mention shouldn't be that big deal :)

[CKEditorBot]

There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

We've closed your issue due to inactivity over the last year. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).

[FilipTokarski]

Reopening as we got a report on this recently.