Merge branch 'stable-2.9' into stable-2.10
* stable-2.9:
Set 'line-height: normal' for lines in side-by-side diff
Add missing documentation of the groups_members cache
SideBySide2: Show file name in window title again
Fix documentation of the default value for core.streamFileThreshold
Bump version to 2.9.2
Conflicts:
VERSION
gerrit-extension-api/pom.xml
gerrit-plugin-api/pom.xml
gerrit-plugin-archetype/pom.xml
gerrit-plugin-gwt-archetype/pom.xml
gerrit-plugin-gwtui/pom.xml
gerrit-plugin-js-archetype/pom.xml
gerrit-war/pom.xml
Change-Id: Ie294e17f71d3df1ec3d52300e22ea5e83834f73f
