Add queued FFmpeg conversion and finish splitting the window from the host.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Explorer.Storage.Tests/StorageTests.cs

@@ -393,6 +393,8 @@ public class FileRelationTests
             RequireGitClean = true,
             DoCompress = true,
             ArchiveFormat = ArchiveFormat.SevenZip,
+            DoConvert = true,
+            ConversionKind = ConversionKind.HeicToJpeg,
             DoCopy = false,
             DoRename = true,
             RenamePrefix = "x_",
@@ -410,6 +412,8 @@ public class FileRelationTests
         Assert.True(loaded.RequireGitClean);
         Assert.True(loaded.DoCompress);
         Assert.Equal(ArchiveFormat.SevenZip, loaded.ArchiveFormat);
+        Assert.True(loaded.DoConvert);
+        Assert.Equal(ConversionKind.HeicToJpeg, loaded.ConversionKind);
         Assert.True(loaded.DoRename);
         Assert.Equal("x_", loaded.RenamePrefix);
         Assert.Equal(".git\nbin", loaded.Excludes);
@@ -471,4 +475,16 @@ public class IndexStoreLockTests
             () => reader.RunWriteAsync(_ => Task.CompletedTask));
         Assert.Contains("read-only", write.Message, StringComparison.OrdinalIgnoreCase);
     }
+
+    [Fact]
+    public async Task IsHeld_is_true_while_a_writer_is_open()
+    {
+        var path = Path.Combine(Path.GetTempPath(), "ew-tests", Guid.NewGuid().ToString("N"), "index.db");
+        Assert.False(IndexStoreLock.IsHeld(path));
+        await using var writer = new SqliteIndexStore(path, NullLogger<SqliteIndexStore>.Instance);
+        await writer.OpenAsync();
+        Assert.True(await Task.Run(() => IndexStoreLock.IsHeld(path)));
+        await writer.DisposeAsync();
+        Assert.False(IndexStoreLock.IsHeld(path));
+    }
 }