See internal bugs http:/b//32455808 and http://b//33355130.
Android IMEs can bracket text with a SuggestionSpan giving alternate possibilities for a word. In practice, this feature is primarily used by Google speech IME, offering a UI to correct possible misinterpretations.
Attached is a video of how the Android native implementation works. There's a light gray underline to indicate the existence of the suggestion, and when the user single-taps on it (not double-tap, despite what the Android docs say), and then a UI dropdown shows the suggestions. Note that the dropdown is a window that overlays on top of the IME window.
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voiceSuggestionsInKeep.mp4
1.7 MB
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Comment 1 by changwan@chromium.org
, Dec 8 2016