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Re: [Lilypond-auto] Issue 2874 in lilypond: Patch: Provide an \undo func


From: lilypond
Subject: Re: [Lilypond-auto] Issue 2874 in lilypond: Patch: Provide an \undo function for turning overrides and sets into reverts and unsets
Date: Fri, 12 Oct 2012 13:42:39 +0000

Updates:
        Status: Fixed
        Labels: -Patch-push Fixed_2_17_5

Comment #9 on issue 2874 by address@hidden: Patch: Provide an \undo function for turning overrides and sets into reverts and unsets
http://code.google.com/p/lilypond/issues/detail?id=2874

Pushed to staging as
commit 71eebe83138ead38e2e6383f6a9f145985e30b08
Author: David Kastrup <address@hidden>
Date:   Wed Oct 3 13:38:24 2012 +0200

Issue 2874: Provide an \undo function for turning overrides and sets into re

    \undo\hideNotes is equivalent to \unHideNotes, \undo\easyHeadsOn to
    \easyHeadsOff.  While this can't undo reverts, it is useful for a lot
    of overriding commands defined in ly/property-init.ly, and is also
    useful in combination with \hide/\omit.

After rethinking Janek's comments, it might make sense to let it warn specifically about any property-modifying commands it can't undo so that the user is not kept in the dark when the command will not fully succeed in its core area of operation, while at the same time ignoring non-property specific music contents silently. But that is something I have to think about and experiment some more. Separate issue, and other commands would warrant similar consideration.




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