Revert "Merge branch 'master' of https://github.com/qurator-spk/sbb_textline_detector"

This reverts commit a3c1eee8f31349edcfb1e36920763bcecceb1129, reversing
changes made to dc76213ffc1fbabc2c45f0e52ced55449bdf2e83.

qurator/dinglehopper/tests/test_editops.py

@@ -0,0 +1,48 @@
+import unicodedata
+
+from .. import seq_editops, editops
+
+
+def test_trivial():
+    assert seq_editops('abc', 'abc') == []
+    assert seq_editops('', '') == []
+
+
+def test_insert():
+    assert seq_editops('bc', 'abc') == [('insert', 0, 0)]
+    assert seq_editops('ac', 'abc') == [('insert', 1, 1)]
+    assert seq_editops('ab', 'abc') == [('insert', 2, 2)]
+    assert seq_editops('', 'a') == [('insert', 0, 0)]
+
+
+def test_multiple():
+    assert seq_editops('bcd', 'abce') == [('insert', 0, 0), ('replace', 2, 3)]
+
+
+def test_delete():
+    assert seq_editops('abcdef', 'cdef') == [('delete', 0, 0), ('delete', 1, 0)]
+    assert seq_editops('Xabcdef', 'Xcdef') == [('delete', 1, 1), ('delete', 2, 1)]
+    assert seq_editops('abcdefg', 'acdefX') == [('delete', 1, 1), ('replace', 6, 5)]
+    assert seq_editops('abcde', 'aabcd') == [('insert', 1, 1), ('delete', 4, 5)]
+    assert seq_editops('Foo', '') == [('delete', 0, 0), ('delete', 1, 0), ('delete', 2, 0)]
+    assert seq_editops('Foolish', 'Foo') == [('delete', 3, 3), ('delete', 4, 3), ('delete', 5, 3), ('delete', 6, 3)]
+
+
+def test_ambiguous():
+    assert seq_editops('bcd', 'abcef') == [('insert', 0, 0), ('replace', 2, 3), ('insert', 3, 4)]
+
+
+def test_editops():
+    """Test editops() in cases where dealing with grapheme clusters matters"""
+
+    # In these cases, one of the words has a composed form, the other one does not.
+    assert editops('Schlyñ', 'Schlym̃') == [('replace', 5, 5)]
+    assert editops('oͤde', 'öde') == [('replace', 0, 0)]
+
+
+def test_editops_canonically_equivalent():
+    left = unicodedata.lookup('LATIN SMALL LETTER N') + unicodedata.lookup('COMBINING TILDE')
+    right = unicodedata.lookup('LATIN SMALL LETTER N WITH TILDE')
+    assert left != right
+    assert unicodedata.normalize('NFC', left) == unicodedata.normalize('NFC', right)
+    assert editops(left, right) == []