Where do I find out about the details and reasons for the patches applied to a package?

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http://askubuntu.com – I am trying to build a package and I am having a problem building it. One (or more) of the patches to doxygen installed with 12.04.1 (Precise), 1.7.4-3 causes doxygen to NOT run my filter script over by Tcl files, if the file is named with an extension of .tcl (the normal extension for Tcl files). If the extension is something else, like .src, the filter is run as expected. I use .tcl for library or helper files that are explictly sources and .src for 'main' programs that are not. (Yes, I have the proper file name patterns, etc. in the Doxyfiles -- my whole package builds just fine under Ce (HowTos)