Utility functions, status messages and model list

Ref T247 follow up

src/blackmisc/simulation/aircraftmodel.cpp

@@ -742,7 +742,9 @@ namespace BlackMisc
         {
             if (!this->hasFileName()) { return false; }
             const QFileInfo fi(CFileUtils::fixWindowsUncPath(this->getFileName()));
-            return (fi.exists() && fi.isReadable());
+            if (!fi.exists()) { return false; }
+            const bool r = fi.isReadable();
+            return r;
         }
 
         QDir CAircraftModel::getFileDirectory() const

src/blackmisc/simulation/aircraftmodellist.cpp

@@ -1325,7 +1325,11 @@ namespace BlackMisc
             if (!alreadySortedByFn) { sorted.sortByFileName(); }
 
             const bool caseSensitive = CFileUtils::isFileNameCaseSensitive();
-            const QString rDir = caseSensitive ? rootDirectory : rootDirectory.toLower();
+            const QString rDir = CFileUtils::normalizeFilePathToQtStandard(
+                                     CFileUtils::stripLeadingSlashOrDriveLetter(
+                                         caseSensitive ? rootDirectory : rootDirectory.toLower()
+                                     )
+                                 );
 
             for (const CAircraftModel &model : as_const(sorted))
             {

src/blackmisc/statusmessagelist.cpp

@@ -133,6 +133,12 @@ namespace BlackMisc
         this->sortBy(&CStatusMessage::getSeverity);
     }
 
+    void CStatusMessageList::sortBySeverityHighestFirst()
+    {
+        this->sortBy(&CStatusMessage::getSeverity);
+        this->reverse();
+    }
+
     void CStatusMessageList::removeWarningsAndBelow()
     {
         if (this->isEmpty()) { return; }

src/blackmisc/statusmessagelist.h

@@ -95,6 +95,9 @@ namespace BlackMisc
         //! Sort by severity, lowest first
         void sortBySeverity();
 
+        //! Sort by severity, highest first
+        void sortBySeverityHighestFirst();
+
         //! Remove warnings and below
         void removeWarningsAndBelow();