feat(web): add helper for tokenizing Transform.insert via tokenization of applied context 🚂 #14805
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This PR adds a method that can determine which parts of a
Transform's.insertcomponent landed within each post-application "token" of the context.When updating our context state information in order to attempt reuse of prior calculations, we need to know where the input's components align with them so that they affect the predictive-text process correctly.
Note that the
.deleteLeftcomponent is instead determined when building the edge window, as it takes effect on the original state and tokenization of the context. (Of particular note here: if a token is fully deleted, there's no reason to preserve it - we can delete it instead [or replace it, if new text is set in the same place].)Relates-to: #14679
Build-bot: skip build:web
Test-bot: skip