[LyX/master] Allow SVGs in HTML output (#7441)

[Scott Kostyshak]

commit 7399d99c98f6e021fdba99666660ad2a380a160f
Author: Scott Kostyshak <skost...@lyx.org>
Date:   Wed May 27 11:25:06 2015 -0400

    Allow SVGs in HTML output (#7441)
    
    This is only a specific part of #7441.
    
    Patch from Julien Rioux.

diff --git a/src/insets/InsetGraphics.cpp b/src/insets/InsetGraphics.cpp
index 7e18ec6..2572669 100644
--- a/src/insets/InsetGraphics.cpp
+++ b/src/insets/InsetGraphics.cpp
@@ -119,8 +119,14 @@ string findTargetFormat(string const & format, 
OutputParams const & runparams)
        }
        // for HTML, we leave the known formats and otherwise convert to png
        if (runparams.flavor == OutputParams::HTML) {
+               Format const * const f = formats.getFormat(format);
+               // Convert vector graphics to svg
+               if (f && f->vectorFormat() && 
theConverters().isReachable(format, "svg"))
+                       return "svg";
+               // Leave the known formats alone
                if (format == "jpg" || format == "png" || format == "gif")
                        return format;
+               // Convert everything else to png
                return "png";
        }
        // If it's postscript, we always do eps.