Here is the quick hack. (To do it properly, this should actually be connected to a checkbox in the settings.)
Index: src/sdk/wxscintilla/src/scintilla/lexers/LexCPP.cxx
===================================================================
--- src/sdk/wxscintilla/src/scintilla/lexers/LexCPP.cxx (revision 8148)
+++ src/sdk/wxscintilla/src/scintilla/lexers/LexCPP.cxx (working copy)
@@ -221,7 +221,7 @@
bool highlightWxSmith;
/* C::B end */
OptionsCPP() {
- stylingWithinPreprocessor = false;
+ stylingWithinPreprocessor = true;
identifiersAllowDollars = true;
trackPreprocessor = true;
updatePreprocessor = true;