e5490f1f5a
Add a checkbox to the preferences header on the diff screen which allows a user to specify whether they want manual-reviewing enabled or disabled. Previously, every file was auto marked reviewed when a user first displayed it. The new manual mode prevents this auto marking and only marks a file reviewed when the user explicitly clicks on the reviewed button. Using the manual mode allows users to better decide when they feel they have reviewed a file. This mode is particularly useful for larger reviews when a user may need to jump around and look at many other files while commenting on a specific one. This prevents their jumping around from file to file from marking the files as reviewed. The intention is to allow the reviewed status to provide more meaning than simply "I have seen the file" (which in many cases might even be a stretch). Change-Id: Iaedbcd717ef8a587a78c56e3d1b5f3fcc86a6d21