[LyX/2.2.x] Enable XHTML export of LilyPond files.

[Richard Heck]

commit 9a953907918d65f51811d0c7929566d9beb7cbac
Author: Richard Heck <rgh...@lyx.org>
Date:   Sun Jul 31 00:36:46 2016 -0400

    Enable  XHTML export of LilyPond files.
    
    (cherry picked from commit b35661b755bb6ef95716eb575561aac4009c140b)
---
 lib/external_templates |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/lib/external_templates b/lib/external_templates
index ec21934..e9cd9a7 100644
--- a/lib/external_templates
+++ b/lib/external_templates
@@ -364,6 +364,12 @@ Template LilyPond
        Format DocBook
                Product "[LilyPond: $$FName]"
        FormatEnd
+       Format XHTML
+               Product "<img src=\"$$AbsOrRelPathMaster$$Basename.png\" />"
+               UpdateFormat png
+               UpdateResult "$$AbsPath$$Basename.png"
+               ReferencedFile xhtml "$$AbsPath$$Basename.png"
+       FormatEnd
 TemplateEnd
 
 Template PDFPages
@@ -406,6 +412,9 @@ Template PDFPages
        Format DocBook
                Product "[PDFPages: $$FName]"
        FormatEnd
+       Format XHTML
+               Product "[PDFPages: $$FName]"
+       FormatEnd
 TemplateEnd