Enhancement Request: Word Highlighting for Diffs #759

Description

When viewing the diff for a small change to an existing line, it would be awesome for the package to use word highlighting to help the developer quickly spot the change. For example, compare the two diffs below. In the current diff display in the Atom github package, you have to look closely to identify which part of the line has changed. In the diff display on github.com, the word highlighting helps you more quickly see the change.

Diff displayed by Atom github package

Diff displayed on github.com

Steps to Reproduce

1. Open a git repository in Atom and change a part of a line for an existing file. For example:
   1. git clone https://github.com/atom/github.git && cd github && atom .
   2. Open the LICENSE file
   3. On the first line change "2016" to "2017"
2. Run "GitHub: Toggle Git Tab"
3. Click on the LICENSE file in the "Unstaged Changes" tab

Expected behavior:

It would be awesome to have the diff highlight the single-character change, much like it does on github.com or via the git command line:

Actual behavior:

The diff does not highlight the single-character change:

Reproduces how often:

Always

Versions

• Atom github package v0.0.2
• Atom 1.18.0-dev-df8dd8b45
• apm 1.18.1
• macOS 10.12.4