Some fixes to improve compability with dot net 6

Will probably remove gzip some more placeces

src/libse/Common/FileUtil.cs

@@ -50,6 +50,35 @@ namespace Nikse.SubtitleEdit.Core.Common
             }
         }
 
+        public static byte[] ReadBytesShared(string path, int bytesToRead)
+        {
+            using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
+            {
+                var index = 0;
+                var fileLength = fs.Length;
+                if (fileLength > int.MaxValue)
+                {
+                    throw new IOException("File too long");
+                }
+
+                var count = Math.Min(bytesToRead, (int)fileLength);
+                var bytes = new byte[count];
+                while (count > 0)
+                {
+                    var n = fs.Read(bytes, index, count);
+                    if (n == 0)
+                    {
+                        throw new InvalidOperationException("End of file reached before expected");
+                    }
+
+                    index += n;
+                    count -= n;
+                }
+
+                return bytes;
+            }
+        }
+
         public static List<string> ReadAllLinesShared(string path, Encoding encoding)
         {
             return encoding.GetString(ReadAllBytesShared(path)).SplitToLines();
@@ -77,6 +106,7 @@ namespace Nikse.SubtitleEdit.Core.Common
                     && buffer[3] == 0x04; // (EOT)
             }
         }
+
         public static bool Is7Zip(string fileName)
         {
             using (var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))

src/ui/Controls/AdvancedTextBox.cs

@@ -919,7 +919,6 @@ namespace Nikse.SubtitleEdit.Controls
             var suggestThread = new System.Threading.Thread(DoWork);
             suggestThread.Start(parameter);
             suggestThread.Join(3000); // wait max 3 seconds
-            suggestThread.Abort();
             if (!parameter.Success)
             {
                 LoadHunspell(_currentDictionary);

src/ui/Forms/SpellCheck.cs

@@ -286,7 +286,6 @@ namespace Nikse.SubtitleEdit.Forms
             var suggestThread = new System.Threading.Thread(DoWork);
             suggestThread.Start(parameter);
             suggestThread.Join(3000); // wait max 3 seconds
-            suggestThread.Abort();
             if (!parameter.Success)
             {
                 LoadHunspell(_currentDictionary);

src/ui/Logic/Ocr/NOcrDb.cs

@@ -33,19 +33,24 @@ namespace Nikse.SubtitleEdit.Logic.Ocr
 
         public void Save()
         {
-            using (Stream gz = new GZipStream(File.OpenWrite(FileName), CompressionMode.Compress))
+            if (File.Exists(FileName))
+            {
+                File.Delete(FileName);
+            }
+
+            using (Stream stream = new FileStream(FileName, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None))
             {
                 var versionBuffer = Encoding.ASCII.GetBytes(Version);
-                gz.Write(versionBuffer, 0, versionBuffer.Length);
+                stream.Write(versionBuffer, 0, versionBuffer.Length);
 
                 foreach (var ocrChar in OcrCharacters)
                 {
-                    ocrChar.Save(gz);
+                    ocrChar.Save(stream);
                 }
 
                 foreach (var ocrChar in OcrCharactersExpanded)
                 {
-                    ocrChar.Save(gz);
+                    ocrChar.Save(stream);
                 }
             }
         }
@@ -63,24 +68,24 @@ namespace Nikse.SubtitleEdit.Logic.Ocr
             }
 
             bool isVersion2;
-            using (Stream gz = new GZipStream(File.OpenRead(FileName), CompressionMode.Decompress))
+            using (Stream stream = GetOpenStream())
             {
                 var versionBuffer = new byte[Version.Length];
-                gz.Read(versionBuffer, 0, versionBuffer.Length);
+                stream.Read(versionBuffer, 0, versionBuffer.Length);
                 isVersion2 = Encoding.ASCII.GetString(versionBuffer) == Version;
             }
 
-            using (Stream gz = new GZipStream(File.OpenRead(FileName), CompressionMode.Decompress))
+            using (Stream stream = GetOpenStream())
             {
                 bool done = false;
                 if (isVersion2)
                 {
                     var versionBuffer = new byte[Version.Length];
-                    gz.Read(versionBuffer, 0, versionBuffer.Length);
+                    stream.Read(versionBuffer, 0, versionBuffer.Length);
                 }
                 while (!done)
                 {
-                    var ocrChar = new NOcrChar(gz, isVersion2);
+                    var ocrChar = new NOcrChar(stream, isVersion2);
                     if (ocrChar.LoadedOk)
                     {
                         if (ocrChar.ExpandCount > 0)
@@ -98,10 +103,25 @@ namespace Nikse.SubtitleEdit.Logic.Ocr
                     }
                 }
             }
+
             OcrCharacters = list;
             OcrCharactersExpanded = listExpanded;
         }
 
+        private Stream GetOpenStream()
+        {
+            var bytes = FileUtil.ReadBytesShared(FileName, 2);
+            var isVersion2Plain = Encoding.ASCII.GetString(bytes) == Version;
+            if (isVersion2Plain)
+            {
+                return new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+            }
+            else
+            {
+                return new GZipStream(File.OpenRead(FileName), CompressionMode.Decompress);
+            }
+        }
+
         public void Add(NOcrChar ocrChar)
         {
             if (ocrChar.ExpandCount > 0)

src/ui/Logic/Ocr/OcrFixEngine.cs

@@ -646,7 +646,7 @@ namespace Nikse.SubtitleEdit.Logic.Ocr
             return word;
         }
 
-        internal static string FixFrenchLApostrophe(string input, string tag, string lastLine)
+        public static string FixFrenchLApostrophe(string input, string tag, string lastLine)
         {
             var text = input;
             bool endingBeforeThis = string.IsNullOrEmpty(lastLine) || lastLine.EndsWith('.') || lastLine.EndsWith('!') || lastLine.EndsWith('?') ||