gerrit 是一个git 仓库，可以快速的对比代码的不同。
下面记录一下快捷键
Navigation within the review UI can be completely done by keys, and most actions can be controlled by keyboard shortcuts. Typing ? opens a popup that shows a list of available keyboard shortcuts:
Change Screen
Side-by-Side Diff Screen
Controls the theme that is used to render the file content.
E.g. users could choose to work with a dark theme.
Controls whether syntax highlighting should be enabled.
The language for the syntax highlighting is automatically detected from the file extension. The language can also be set manually by selecting it from the Language drop-down list.
