00f15c1075
If the arrow's origin is so close to the edge that the arrow will not
be isosceles, we try to compensate as follows:
- We skip the rounded corner and settle for a right angled arrow as
as shown below.
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- If the arrow was going to be acute angled, we move the position of
the box to maintain the arrow's accuracy.
https://bugzilla.gnome.org/show_bug.cgi?id=680077