Answers:
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Question 1:
- the blue ones are used for cuspid type; shown in context menu of Width Points of Advanced Countour layers;
- the next ones, but last one, are used in the new Resize Canvas dialog ;
- the last one I don’t know.
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Question 2
Some names can be seen here:
https://specifications.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html
https://developer-old.gnome.org/icon-naming-spec/
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Question 3
All of these listed value type names can’t currently have an icon. As coded right now, if such icon doesn’t exist, the app crashes. The solutions are:- to provide respective icons to current theme (and then change the code to search for them; thus, other themes can replace them); or
- change the code to check the icon existence or anything that prevents the crash in a GtkTreeView
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Question 4
I didn’t understand. Do you want to know the difference between integer numbers, real numbers and vectors?