[LyX/master] Fix disappearing blue language underline.

[Jean-Marc Lasgouttes]

commit 8e9e05067014a7c5fad501a0f4e8ffbb56eed165
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Fri Jul 20 15:23:55 2018 +0200

    Fix disappearing blue language underline.
    
    Make sure that the blue language underline is not below the bottom of
    the row. Otherwise, it can disappear when the next row is painted.
---
 src/RowPainter.cpp |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/RowPainter.cpp b/src/RowPainter.cpp
index a929340..16b144e 100644
--- a/src/RowPainter.cpp
+++ b/src/RowPainter.cpp
@@ -157,8 +157,8 @@ void RowPainter::paintForeignMark(Row::Element const & e) 
const
                return;
 
        int const desc = e.inset ? e.dim.descent() : 0;
-       int const y = yo_ + pi_.base.solidLineOffset()
-               + desc + pi_.base.solidLineThickness() / 2;
+       int const y = yo_ + min(3 * pi_.base.solidLineOffset() / 2 + desc,
+                               row_.descent() - 1);
        pi_.pain.line(int(x_), y, int(x_ + e.full_width()), y, Color_language,
                      Painter::line_solid, pi_.base.solidLineThickness());
 }