New Sections

A quick warning about the insertSections:withRowAnimation: method of UITableView. If you insert a section with this function inside a beginUpdates/endUpdates block, you should not insert rows into that section (with insertRowsAtIndexPaths:withRowAnimation:) inside the same begin/end block. Somewhat confusingly, the first row insertion appears to work correctly, but subsequent ones tend to crash the program. Caveat insertor.

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