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
Split |ChangeFocus| into two separate functions: |GetFocusableFrame| and |ChangeFocusToOrClearOldFocus|. We should only change the focus to the focusable frame until AccessibleCaretManager is going to: 1) Dispatch CaretStateChangedEvent on an empty editable field. 2) Select a word on a selectable frame. --HG-- extra : transplant_source : %C9v%F6%9B%EE%85y%9B0%AD8%CB%1B%E1%22%98%DE%D5%B9e