Creating a nested span on 4th level of nesting fails

[dkalpakchi]

Describe the bug
Attempting to create the span that covers 2 already existing spans, fails. Interestingly, this fails only if the first span already has 3+ levels of nesting.

To Reproduce

1. Get the spans and create a selection as in picture 1
2. Attempt to create a new span over the 2 in picture 1 (see result in picture 2)

Expected behavior
The span should be created correctly

Screenshots
Picture 1:

Picture 2:

Textinator version
Latest

Desktop (please complete the following information):

• OS: Ubuntu 22.10
• Browser: Firefox
• Version: 110

[dkalpakchi]

Worked like a charm in this case, so the problem seems to be two labels with 3+ levels of nesting, not the levels of nesting themselves