Huge performance hit when adding new property at the end of the large .properties file (IDEA-101698)
Clone dialog repository url label changed according  to selected vcs name.
Easter fog: works if today is 1 Apr (or there is -Deggs=true)
You can switch it off by -Dnoeggs=true
Note: Fog won;t start if there are less than 4 CPU or if there are less than 32Mb of free memory
correcttions after review: using as unique IDs instances of Object instead of Key, which is stored in a never cleared static Map
Added extension point for import buttons in Colors & Fonts preferences
UI
diff: do not break layout if we don't know revision number