Investigating reasons of fail FontTest tests i found bug in
MultiCompositionScaner (or it maybe some related class). Looks like
what Character value: 257 had a special meaning in squeak. If not use
StrikeFont everything is well, but if you choose FreeType font the
doing something
(Character value: 257) asString asTextMorph openInWorld
creates an endles loop in composer. It founds character falls in
crossedX method (this character is stopCondition) and then remove
character from composition and starts again.