[LyX/master] Make sure we center displayed equations.

[Richard Heck]

commit a8aa7feb8936b751f088a10764b1f3623f143c77
Author: Richard Heck <rgh...@lyx.org>
Date:   Wed Jun 29 23:18:57 2016 -0400

    Make sure we center displayed equations.
---
 src/mathed/InsetMathHull.cpp |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index 513a896..beb3b2a 100644
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -2486,7 +2486,9 @@ docstring InsetMathHull::xhtml(XHTMLStream & xs, 
OutputParams const & op) const
        //    )
        // but what follows is equivalent, since we'll enter only if either (a) 
we
        // tried and failed with MathML or HTML or (b) didn't try yet at all but
-       // aren't doing LaTeX, in which case we are doing Images.
+       // aren't doing LaTeX.
+       //
+       // so this is for Images.
        if (!success && mathtype != BufferParams::LaTeX) {
                graphics::PreviewImage const * pimage = 0;
                if (!op.dryrun) {
@@ -2513,7 +2515,7 @@ docstring InsetMathHull::xhtml(XHTMLStream & xs, 
OutputParams const & op) const
 
                        string const tag = (getType() == hullSimple) ? "span" : 
"div";
                        xs << html::CR()
-                          << html::StartTag(tag)
+                          << html::StartTag(tag, "style = \"text-align: 
center;\"")
                                 << html::CompTag("img", "src=\"" + filename + 
"\" alt=\"Mathematical Equation\"")
                                 << html::EndTag(tag)
                                 << html::CR();