fix(navigator): wrong spans after selection

[ksqsf]

The cached spans can be wrong if not invalidated after selection.

Consider: aabbccdd which can be understood as both 'aa'bb'cc'dd' and 'aab'bcc'dd'.

Suppose the first candidate is from 'aa'bb'cc'dd'. Now do {Control+Right}{Right}{Space} to select the first candidate of aab. Now do {Control+Right} again:

• Expected: [aab]bcc|dd
• Actual: [aab]b|ccdd (| is the caret)

This is because the spans are not recomputed even if we have picked a specific kind of segmentation. This PR adds a select handler and clears the spans to force the recomputation of the spans.

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1. Unit and manual test pass
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3. At least one contributor reviews and votes
4. Can be merged clean without conflicts
5. PR will be merged by rebase upstream base

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