#5386 Make grob-transform robust against cloned invocations

[David Kastrup]

Make grob-transform robust against cloned invocations

Well, "robust" is a bit of an exaggeration but at least it
doesn't crash anymore. It just drops transforms (and warns about that)
until the rest can be handled safely.

Also contains commit:

Add ly:grob-warning function

http://codereview.appspot.com/367760043

[Anonymous]

Passes make, make check and a full make doc

[Anonymous]

Patch on countdown for July 22nd.

[Anonymous]

Patch counted down - please push

[David Kastrup]

Pushed to staging as
commit 6acfd88d538942f75783b40a4cb959d5521e9d5d
Author: David Kastrup dak@gnu.org
Date: Tue Jul 17 19:11:13 2018 +0200

Issue 5386/2: Make grob-transform robust against cloned invocations

Well, "robust" is a bit of an exaggeration but at least it
doesn't crash anymore.  It just drops transforms (and warns about that)
until the rest can be handled safely.

commit 2b9ead92eabe402a15df23e847518b0c5588e15e
Author: David Kastrup dak@gnu.org
Date: Tue Jul 17 19:09:33 2018 +0200

Issue 5386/1: Add ly:grob-warning function