This patch adds further improvements and corrections to the LineCollection module:
Inserting lines at arbitrary indexes (rather than only at the end of the selection) is now once again possible through a parameter to :addLines(). Indexed and unnumbered (tail) can be mixed without issues.
Tail lines are now inserted in the order they were added to the collection (was reverse order before)
Inserting tail lines from a collection created without a selection no longer results in an error. The lines will be added below the last dialogue line in the file.
This patch adds further improvements and corrections to the LineCollection module: