This wasn't private at all since I actually had added this very example to the
regtests:
input/regression/skyline-grob-rotation.ly
It should have shown up in the standard regtest procedures, I'll check this.
By the way: grob rotation (the printed stencil) uses rotate_degrees, i.e. the
offset co-ordinates are "measured in terms of the extent of the stencil, so -1
= LEFT/DOWN edge, 1 = RIGHT/UP edge." (cited from a comment in the coding).
This was the reason that drove me into rotating a copy of the stencil using
rotate_degrees as an easy way to get the exact same behaviour for skylines and
the printed stencil later on. Unfortunately, I was totally ignorant of garbage
collection.
---
** [issues:#5346] Fix GC issue in skyline rotations**
**Status:** Started
**Created:** Fri Jun 15, 2018 03:32 PM UTC by David Kastrup
**Last Updated:** Sat Jun 16, 2018 12:27 PM UTC
**Owner:** David Kastrup
Fix GC issue in skyline rotations
This was issue 5341 initially and is a fix for a problem introduced
during issue 5319. The problem basically is that a rotated Stencil is
created and its stencil expression is getting stored on the heap
without retaining any pointer to it in areas scanned during garbage
collections.
This fix is a minimal one that merely avoids creating a stencil and
instead simulates the effect on the transform matrix to be expected
from using a rotated stencil.
http://codereview.appspot.com/344960043
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