Flatten components: handle transformed (scaled) components

[moyogo]

Fixes #442 Flattening components does not handle transformed components well.

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[anthrotype]

Thank you Denis!
@khaledhosny the googlebot wants your consent, since Denis committed on your behalf. If you're ok, could you please confirm? thanks

[khaledhosny]

@googlebot I consent.

[moyogo]

Thanks @khaledhosny !