ClangTools: Allow to disable a specific type of diagnostic

... from the results list.
This is much more convenient for the user than having to locate the
diagnostic in the settings first.
This patch deals with the global settings. We plan to offer the same for
project-level settings in a follow-up patch.

Task-number: QTCREATORBUG-24852
Change-Id: I7a97189c393048b98b9c2cdb6f21861a34670e8f
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangtools/clangtoolsutils.cpp

@@ -256,6 +256,11 @@ QString clazyStandaloneExecutable()
 }
 
 static void addBuiltinConfigs(ClangDiagnosticConfigsModel &model)
+{
+    model.appendOrUpdate(builtinConfig());
+}
+
+ClangDiagnosticConfig builtinConfig()
 {
     ClangDiagnosticConfig config;
     config.setId(Constants::DIAG_CONFIG_TIDY_AND_CLAZY);
@@ -265,8 +270,7 @@ static void addBuiltinConfigs(ClangDiagnosticConfigsModel &model)
     config.setClangOptions({"-w"}); // Do not emit any clang-only warnings
     config.setClangTidyMode(ClangDiagnosticConfig::TidyMode::UseDefaultChecks);
     config.setClazyMode(ClangDiagnosticConfig::ClazyMode::UseDefaultChecks);
-
-    model.appendOrUpdate(config);
+    return config;
 }
 
 ClangDiagnosticConfigsModel diagnosticConfigsModel(const ClangDiagnosticConfigs &customConfigs)