Bug Scheduled Mail : if try cancel email only 10 at a time are cancel not more?

Affected Version
5.2 RC16

bot

Botimar
if try cancel email only 10 at a time are canceled not more? if change selection to 1000 per page view, then select all and cancel it only cancel 10 emails, basically you cannot cancel more than 10 emails from scheduled mail list? please fix this bug. in addition when message comes up to read mail successfully cancelled, it should confirm the number of emails cancelled?
 
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