Project/context autocompletion does not work after certain character position

[t7ko]

If you type in long enough task (e.g. 120 chars) and try entering + in various places within this task, you'll notice: it causes completing at the beginning of the task text, but starting at some position, completion dialog is not launching.

[t7ko]

UPD: the dialog is displayed, but it's position is off the screen (you can see it in dual-monitor mode, when jdotxt is on left screen -- completion list is displayed far away to the right, on the right screen).