Fix some runtime exceptions with msvc-built libvisio

The previous code was causing silent exceptions in some particular
cases. Passing through a temporary works well.

Change-Id: I71a9a58b98b5f392da4d8a4c8d08ddc1487ec79f

libvisio/UnpackedTarball_libvisio.mk

@@ -11,4 +11,8 @@ $(eval $(call gb_UnpackedTarball_UnpackedTarball,libvisio))
 
 $(eval $(call gb_UnpackedTarball_set_tarball,libvisio,$(VISIO_TARBALL)))
 
+$(eval $(call gb_UnpackedTarball_add_patches,libvisio,\
+	libvisio/libvisio-0.0.30-msvc.patch.1 \
+))
+
 # vim: set noet sw=4 ts=4:

libvisio/libvisio-0.0.30-msvc.patch.1

+--- a/src/lib/VSDContentCollector.cpp
++++ b/src/lib/VSDContentCollector.cpp
+@@ -655,7 +655,8 @@ void libvisio::VSDContentCollector::_flushText()
+       {
+         // Insert duplicate
+         std::vector<VSDCharStyle>::iterator charIt = m_charFormats.begin() + charIndex;
+-        m_charFormats.insert(charIt, m_charFormats[charIndex]);
++        VSDCharStyle tmpCharFormat = m_charFormats[charIndex];
++        m_charFormats.insert(charIt, tmpCharFormat);
+         m_charFormats[charIndex].charCount = paraCharCount;
+         m_charFormats[charIndex+1].charCount -= paraCharCount;
+       }