For `lex_Matra_pre` vowels (such as `ि` ) the dotted circle should appear after the vowel sign. I had this snippet for `mark_invalid_combinations` in my attempt to solve this, maybe this could help? ```c if (is_invalid) { original_clust = pwLogClust[i]; insert_pos = g; if (unicode_lex(pwcChars[i]) == lex_Matra_pre) insert_pos = g + 1; insert_glyph(pwGlyphs, pcGlyphs, cChars, write_dir, invalid_glyph, insert_pos, pwLogClust); if (insert_pos > original_clust && write_dir > 0) for (j = 0; j < cChars; j++) if (pwLogClust[j] == original_clust + 1) pwLogClust[j] = original_clust; g++; } ``` There are also some indic vowel signs such as `ൌ` or `ৌ` where the dotted circle should appear in the middle. -- https://gitlab.winehq.org/wine/wine/-/merge_requests/10704#note_137254