PDF+LaTeX export: Avoid printing empty boxes

This also fixes an issue with multipage PDF output where an empty
string would have been assumed to require emission of the previous
page when in fact the CairoRenderer does not produce a new page in
this case resulting in another facet of
  https://bugs.launchpad.net/ubuntu/+source/inkscape/+bug/1417470

Invisible characters might still cause this issue but it seems to be
a very unlikely scenario and there's no way to know this without
actually rendering the glyphs (which seems to be overkill here)

1 files changed, 5 insertions, 0 deletions

diff --git a/src/extension/internal/latex-text-renderer.cpp b/src/extension/internal/latex-text-renderer.cpp
index d1cf7e484..3e90881ac 100644
--- a/src/extension/internal/latex-text-renderer.cpp
+++ b/src/extension/internal/latex-text-renderer.cpp
@@ -260,6 +260,11 @@ void LaTeXTextRenderer::sp_use_render(SPUse *use)
 
 void LaTeXTextRenderer::sp_text_render(SPText *textobj)
 {
+    // Nothing to do here... (so don't emit an empty box)
+    // Also avoids falling out of sync with the CairoRenderer (which won't render anything in this case either)
+    if (textobj->layout.getActualLength() == 0)
+        return;
+
     // Only PDFLaTeX supports importing a single page of a graphics file,
     // so only PDF backend gets interleaved text/graphics
     if (_pdflatex && _omittext_state ==  GRAPHIC_ON_TOP)