Improve genhtml configuration to produce better coverage reports

CMakeLists.txt

@@ -320,7 +320,7 @@ if("${CMAKE_BUILD_TYPE}" STREQUAL "Coverage")
       ALL
       COMMAND ${CMAKE_COMMAND} -E remove_directory "${PUGS_BINARY_DIR}/coverage"
       COMMAND ${CMAKE_COMMAND} -E make_directory "${PUGS_BINARY_DIR}/coverage"
-      COMMAND ${GENHTML} -q -o coverage -t "${CMAKE_PROJECT_NAME} test coverage" --ignore-errors source --legend --num-spaces 4 coverage.info
+      COMMAND ${GENHTML} --demangle-cpp -q -o coverage -t "${CMAKE_PROJECT_NAME} test coverage" --ignore-errors source --legend --num-spaces 2 coverage.info
       DEPENDS coverage
       COMMENT "Building coverage html report."
       WORKING_DIRECTORY "${PUGS_BINARY_DIR}"