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e585a6bbcf
Support upto 3 levels os nesting signal blocking. As of today - code blocks signals immediatelly when it opens VG in read-write mode - this however makes current prompt usage then partially unusable since user may not 'break' command during prompt (something most user would expect). Until a better fix for prompting is implemented, put in support for signal nesting - thus when prompt enables signal acceptance, make it possible to really break command at this point.