animator_uid matches a uid before an index, so an animator whose uid
equals an index is picked over the one at that position. The four
commands that take `animator` (layer.addTextAnimatorProperty,
layer.addTextSelector, text.addSelector, text.animatorFontAxes) now say
so; text.addSelector also said only `uid|index` before. The test gives a
second animator uid 1 and checks that `animator: 1` picks it.
JonRC
0b59d2b8c4