Fix bug in Leaf keyword highlighting

[fpseverino]

Changes

Fix a bug in the Leaf syntax where keywords are highlighted when at the start of a variable name (see the third code block here)

Checklist

• Added markup tests, or they don't apply here because...
• Updated the changelog at CHANGES.md

[joshgoebel]

Thanks! Please also add a changelog entry as well as markup test case.

[fpseverino]

Please also add a changelog entry as well as markup test case.

@joshgoebel done! I hope I did it correctly

[joshgoebel]

Except we need a test that would have failed before - so that we prevent this regression in the future... so we need an example of what would have failed before.

[fpseverino]

#elseif(index == "Welcome back!"):

This would have failed, as the in in index would have been highlighted as a keyword.
There was already in the test another case in which in is correctly highlighted as a keyword.

[joshgoebel]

Ah, I see. :)

[github-actions]

Build Size Report

Changes to minified artifacts in /build, after gzip compression.

3 files changed

Total change +60 B

View Changes

file	base	pr	diff
es/languages/leaf.min.js	435 B	464 B	+29 B
highlight.min.js	8.23 KB	8.23 KB	+1 B
languages/leaf.min.js	439 B	469 B	+30 B

[fpseverino]

@joshgoebel do we need anything else to get this merged?