Matthias Clasen d2430c70bd Refresh the tutorial examples ...

Redo this series of examples from 2013, and adapt it to modern
way of doing things. The biggest differences are that we use
a headerbar right from the start, and don't mention the app
menu.

Fixes: #2730

2020-05-11 08:15:56 -04:00

150 KiB

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