Comment # 4 on bug 1226207 from Mykola Krachkovsky

(In reply to Christophe Marin from comment #3)
> The option seems to have another effect: a lot of other svg files are also
> modified with very small color changes and some CR are removed

True. It seems `generate-symbolic-dark.cpp` doesn't check if change is really
needed and a lot of not current-color symbolic icons (e.g.
`places/22/folder-android.svg`) have unused ColorScheme-Text style. Maybe add
detection of usage to that script? Check for something like
`class="ColorScheme-Text"`/`class="ColorScheme-Background"` (I don't see any
class attributes with more than one class) and if none found, skip file?