Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: mmzeeman

src/diffy.erl

@@ -1518,11 +1518,11 @@ common_overlap_test() ->
 common_overlap_loop_test() ->
     Abc = to_utf32(<<"abc">>),
     Cde = to_utf32(<<"cde">>),
-    ?assertEqual(1, common_overlap_loop(Abc, Cde, text_size(Cde), 0, 1)),
+    ?assertEqual(1, common_overlap_loop(Abc, Cde, text_size32(Cde), 0, 1)),
 
     Abcdef = to_utf32(<<"abcdef">>),
     Efde = to_utf32(<<"efde">>),
-    ?assertEqual(2, common_overlap_loop(Abcdef, Efde, text_size(Efde), 0, 1)),
+    ?assertEqual(2, common_overlap_loop(Abcdef, Efde, text_size32(Efde), 0, 1)),
 
     ok.