This is similar to 21168 (which was fixed on r57882).
In old texts from Wikisource it is also used some other characters which I think should be added to linkTrail:
ẽ
ò
q̃
ű
ũ
For some examples of use of these characters see:
http://pt.wikisource.org/wiki/Livro_da_ensinan%C3%A7a_de_bem_cavalgar_toda_sella/Capitulo_III-XIX
http://pt.wikisource.org/wiki/Auto_da_Barca_do_Inferno/O_Frade
http://pt.wikisource.org/wiki/Fex_%C5%A9a_cantiga_d'amor
http://pt.wikisource.org/wiki/Candido_de_Figueiredo_1913/Extrofia
Version: 1.17.x
Severity: enhancement