The checkboxes in a treeview do not honour the property "indicator-size".
I consider this one an enhancement (since it's more like not-yet-implemented feature). I do not promise "fixing" this before 0.7.0 final release, but I'll see how can I improve the drawing function so that we can take the indicator-size into account.
Implemented in git.
Thanks for the fix - It is working as expected, now.
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