Make sure to build with strict compile flags + port to no deprecated

method

CMakeLists.txt

@@ -34,7 +34,11 @@ ecm_setup_version(PROJECT VARIABLE_PREFIX KITEMMODELS
                         PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5ItemModelsConfigVersion.cmake"
                         SOVERSION 5)
 
-
+add_definitions(-DQT_NO_CAST_FROM_ASCII)
+add_definitions(-DQT_NO_CAST_TO_ASCII)
+add_definitions(-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT)
+add_definitions(-DQT_NO_URL_CAST_FROM_STRING)
+add_definitions(-DQT_USE_QSTRINGBUILDER)
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)

src/kselectionproxymodel.cpp

@@ -399,7 +399,7 @@ static QItemSelection kNormalizeSelection(QItemSelection selection)
     }
 
     RangeLessThan lt;
-    qSort(selection.begin(), selection.end(), lt);
+    std::sort(selection.begin(), selection.end(), lt);
     return stableNormalizeSelection(selection);
 }