AssertionError and TypeError message spam in terminal while comparing files

[Juozas Pocius]

Running meld from command line triggers a bunch of AssertionError and TypeError message spam while running in terminal. The errors shown below are repeating indefinitely while merging files.

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/filediff.py", line 855, in after_text_delete_range
    self._after_text_modified(buf, starting_at, -self.lines_removed)
  File "/usr/lib/python3/dist-packages/meld/filediff.py", line 808, in _after_text_modified
    self.linediffer.change_sequence(pane, startline, sizechange,
  File "/usr/lib/python3/dist-packages/meld/matchers/diffutil.py", line 202, in change_sequence
    self._change_sequence(0, sequence, startidx, sizechange, texts)
  File "/usr/lib/python3/dist-packages/meld/matchers/diffutil.py", line 331, in _change_sequence
    assert rangex[0] <= rangex[1] and range1[0] <= range1[1]
AssertionError
<repeats a few times>
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/filediff.py", line 848, in after_text_insert_text
    starting_at = buf.get_iter_at_mark(start_mark).get_line()
TypeError: Argument 2 does not allow None as a value
<repeats indefinitely>

Python version 3.10.4

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: meld 3.20.4-2
ProcVersionSignature: Ubuntu 5.15.0-40.43-generic 5.15.35
Uname: Linux 5.15.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Sun Jul 10 18:07:14 2022
PackageArchitecture: all
SourcePackage: meld
UpgradeStatus: No upgrade log present (probably fresh install)

[lotuspsychje (lotuspsychje)]

i tested this on an installed Ubuntu 22.04 (desktop)

and it seems to run both GUI and CLI withour the errors as described above

maybe something XFCE related?