If config.plugins.autocomplete.min_len is greater than 1, when the autocomplete dialog is open, the completion isn't updated until min_len is reached. In servers that reply with a textEdit, this causes the following behavior:

In this case config.plugins.autocomplete.min_len was 3.
In the first attempt I'm writing only 2 chars, and then confirming the autocomplete. This leads to those two chars to be kept.
In the second attempt I'm writing 3 chars, enough to trigger an update, so when I confirm the autocomplete, the result is correct.

Two solutions come to mind:

1. Updating when the autocomplete menu is open.
2. When applying the textEdit we should manually delete the partial.

Solution 1 could potentially lead to problems with slower servers.
Solution 2 needs a patch to the autocomplete plugin.

For now I'll implement solution 1.