Hi All! In the gtk3 branch, the GtkNotebook that allows you to view either the content of a message or the tree of message parts has been replaced by a GtkStack. It works the same: if the message has more than one part, you see a pair of buttons that work just like notebook tabs, though not rendered exactly like tabs. One advantage is that the child is rendered the same way regardless of whether the buttons are visible, which required some messy low-level coding to achieve with GtkNotebook. GtkStack also supports many types of transition between children, and just to play with it I made it an up-down slide. It's quite unobtrusive, but if it offends you, please let us know! Best, Peter
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