Clicking below the last line (if not empty) in the code editor logs an error

[adamscoble]

Godot version

4.0.beta6

System information

Windows 10

Issue description

If you have some code in a script and the last line is not an empty line, clicking below that line will log this error on each click:

GDScript parser bug: Trying to advance past the end of stream.
scene/gui/text_edit.cpp:4911 - Index p_column = 18 is out of bounds (text[carets[p_caret].selection.selecting_line].length() + 1 = 18).

Steps to reproduce

1. Create or open a script.
2. Remove any empty (just new line characters) trailing lines.
3. Click below the last line.

Minimal reproduction project

N/A

[Rindbee]

A duplicate of #69011 fixed by #69054.