fix(highlight): support non-text nodes

[nicholaschiang]

Fixes PD-112

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployments, click below or on the icon next to each commit.

hammock – ./

🔍 Inspect: https://vercel.com/readhammock/hammock/6CgA5LuCsNA8g9MpiShx4YFE87C6
✅ Preview: https://hammock-git-highlight-readhammock.vercel.app

[linear[bot]]

PD-112 Support non-text start/end nodes

Right now, the `lib/highlight.ts` utility fails when either the highlight start or end nodes aren't `#text` nodes. This can occur when a user double clicks to select e.g. an entire paragraph at a time. In that scenario, both the start and the end nodes are the `p` itself. Hammock should simply traverse down the tree until we get to a `#text` node as it does normally when highlighting intermediate nodes (between the start and end).

[codecov[bot]]

Codecov Report

Merging #140 (dbcc68f) into develop (46db9a0) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop     #140      +/-   ##
===========================================
- Coverage    36.86%   36.85%   -0.01%     
===========================================
  Files           82       81       -1     
  Lines         1378     1362      -16     
  Branches       404      396       -8     
===========================================
- Hits           508      502       -6     
+ Misses         870      860      -10     

Impacted Files	Coverage Δ
components/article.tsx	0.00% <0.00%> (ø)
lib/highlight.ts	6.34% <0.00%> (-0.93%)	:arrow_down:
pages/api/redirect.ts
lib/fetch.ts	81.25% <0.00%> (+6.25%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 46db9a0...dbcc68f. Read the comment docs.