Wyatt Allen d970500d62 Annotate trailing whitespace per user preference ...

Add a simple annotation layer that marks trailing whitespace in diffs
(guarded by the `show_whitespace_errors` diff preference). The newly
supported diff preference is added to both diff preference controls. The
requirement that all annotation layers must implement `addListener` is
relaxed as the trailing whitespace layer is the third layer that doesn't
use it.

Adds tests for the layer and the diff preference.

Feature: Issue 4836
Change-Id: Ifba05216bf0bc3c0a8a094f5ef392b983091d59f

2016-11-20 13:31:30 -08:00

15 KiB

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