[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5346 Fix GC issue in skyline rotations

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[issues:#5346] Fix GC issue in skyline rotations

Status: Started
Created: Fri Jun 15, 2018 03:32 PM UTC by David Kastrup
Last Updated: Fri Jun 15, 2018 03:32 PM UTC
Owner: nobody

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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