text_buffer->undo

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text_buffer->undo

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text_buffer ->undo:

Undo all changes to the text_buffer back to the last text_buffer->undo_mark. If this is a text_buffer->reset_undo checkpoint, reset text_buffer->modified to @off. Changes are stored in a buffer of size text_buffer<-undo_buffer_size. Changes that exhaust the size of this buffer are lost.