Thank

I found what I need in uppsrc/ide/Core/Core.cpp.
The patch:

--- uppsrc/ide/Core/Core.cpp.OLD        2016-10-15 16:42:07.000000000 +0200
+++ uppsrc/ide/Core/Core.cpp    2017-01-15 22:57:18.174354625 +0100
@@ -78,7 +78,7 @@
        String out;
        for(; *fn; fn++)
                if(*fn == '$')
-                       out << '$' << '$';
+                       out << "$$$$";
                else
                        out << *fn;
        return out;