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Matthias Clasen authored
The slider gadget may be turned invisible as side-effect of gtk_range_calc_slider(). If that happens, gtk_css_gadget_get_content_allocation() returns { 0, 0, 0, 0}, which leads us to calculate a negative allocation for the highlight node. Avoid this, by just reusing our already calculated slider allocation in this case (it is not technically the same as the content, allocation, but the difference hardly matter here. https://bugzilla.gnome.org/show_bug.cgi?id=764022
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