#2 Hx hold when caret pre/nxt

[steveneo]

Layer can't be set manually. But Hx size is zero, and
accroding now logic, it can't be set to over zero layer.
So it can hold caret when caret do pre/nxt. It's
unexpected.

[steveneo]

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I change setLayer() logic, now Hx can be set correctly layer.