While encountering MGNLIMG-210 it turned out that one possible way to counter uncertainty and spikes created by generating too many variants concurrently would be to pre-generate and cache said asset variants, already known to be requested by action bar or workbench upon save of dialog and return to browse subapp, while saving the asset.

Acceptance criteria:

• make pre-generation of variants optional
• do not fail to save asset even when generation fails
• generate variants only for images