Gtk4: Widget snapshot

[ebassi (Emmanuele Bassi)]

@aeldemery

this implies that overriding this function is not a requirement for custom drawing to work, or so was my understanding.

It’s not necessary unless your widget’s size is driven by something else; unless:

• you use the expand flags
• the parent container automatically expands its children
• you provide a measure() implementation
• you have a CSS fragment that provides a minimum with and height

then the minimum and natural sizes of your widget are going to be 0×0—just like in GTK3.