Enable trailing commas in code style #1155
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Description
This changes the IDE behaviour so that running auto-formatting on a file will add trailing commas to appropriate places. I didn't want to reformat the entire project and touch all files this PR, but hopefully we'll have more and more trailing commas in the project with this change over time, as we format the files that we touch (please run IDE formatting before commits!).
ktlint, unfortunately, doesn't pick this up yet (see pinterest/ktlint#709).
Checklist
developbranchChangelog updated with client-facing changesNew code is covered by unit tests