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Fixes b/15734816 In the text "Wi-Fi", "-Fi" appears bolder than "Wi" The problem was caused by "stickiness" in choosing fonts, where layout would prefer using a font used for preceding characters as long as it mapped the following characters in a run, in favor of the "best match" rules. This patch adds a whitelist for making the stickiness more conservative, only applying it for characters necessary for correct shaping (ZWJ and ZWNJ in particular) and basic punctuation, where it is desirable to match the style of the preceding text. Change-Id: I1cf116879f074a5a71c351846707bfdd07b0d320