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leaflet: Unsatisfied needed alloc generates a critical

Here is the error message:

(example:2): Gtk-CRITICAL **: 09:42:18.043: gtk_widget_draw: assertion '!widget->priv->alloc_needed' failed

To reproduce it you could:

  • have a leaflet with a stack switcher and a non-homogeneous stack,
  • have the leaflet unfolded but on the verge of being folded,
  • select a stack child that is larger than the current one so the stack make the leaflet fold itself.

I don't manage to reproduce the issue consistently, if you find a good way to do so please let me know.

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