Illustration by Alex Castro / The VergeImagine, for a moment, if you didn’t have to select emails one by one to archive, delete, or mark as read. 9to5Google is reporting that Gmail for Android now has a “Select all” b***on that selects 50 emails at a time. Images: 9to5GoogleSelect 50 at a time.Now, a certain kind of reader will surely ask: why doesn’t the “select all” b***on select all the emails? I salute you, friend. But Gmail for Android has infinite scroll, so selecting all the emails would really be all the emails, not just, like, a page worth of them. Maybe they should rename the b***on instead. Desktop Gmail also lets you select 50 emails to begin with, but it doesn’t call the b***on “select all,” and there’s an extra “select all…