Show folder names immediately and refresh stale index sizes without walking the whole drive.

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

tests/Explorer.Application.Tests/TreeRevealSelectorTests.cs

@@ -0,0 +1,77 @@
+using Explorer.Application;
+
+namespace Explorer.Application.Tests;
+
+public class TreeRevealSelectorTests
+{
+    private static readonly TreeRevealCandidate Drive = new(@"D:\", false);
+    private static readonly TreeRevealCandidate Photos = new(@"D:\Photos", true);
+    private static readonly TreeRevealCandidate HomeDocs = new(@"C:\Users\Dominique\Documents", false);
+    private static readonly TreeRevealCandidate FavDocs = new(@"C:\Users\Dominique\Documents", true);
+
+    [Fact]
+    public void This_pc_context_does_not_jump_to_a_matching_favorite()
+    {
+        var chosen = TreeRevealSelector.Choose(
+            [Photos, Drive],
+            @"D:\Photos\Vacation",
+            preferFavorites: false,
+            currentlyInFavorites: false);
+        Assert.Equal(Drive, chosen);
+    }
+
+    [Fact]
+    public void Favorite_context_stays_in_the_favorite()
+    {
+        var chosen = TreeRevealSelector.Choose(
+            [Photos, Drive],
+            @"D:\Photos\Vacation",
+            preferFavorites: false,
+            currentlyInFavorites: true);
+        Assert.Equal(Photos, chosen);
+    }
+
+    [Fact]
+    public void Leaving_a_favorite_falls_back_to_the_drive()
+    {
+        var chosen = TreeRevealSelector.Choose(
+            [Photos, Drive],
+            @"D:\Other",
+            preferFavorites: false,
+            currentlyInFavorites: true);
+        Assert.Equal(Drive, chosen);
+    }
+
+    [Fact]
+    public void Prefer_favorites_selects_the_pin_from_this_pc()
+    {
+        var chosen = TreeRevealSelector.Choose(
+            [Photos, Drive],
+            @"D:\Photos\Vacation",
+            preferFavorites: true,
+            currentlyInFavorites: false);
+        Assert.Equal(Photos, chosen);
+    }
+
+    [Fact]
+    public void Home_beats_the_drive_when_favorites_are_not_preferred()
+    {
+        var chosen = TreeRevealSelector.Choose(
+            [FavDocs, HomeDocs, new(@"C:\", false)],
+            @"C:\Users\Dominique\Documents\Work",
+            preferFavorites: false,
+            currentlyInFavorites: false);
+        Assert.Equal(HomeDocs, chosen);
+    }
+
+    [Fact]
+    public void Prefer_favorites_selects_the_documents_pin_over_home()
+    {
+        var chosen = TreeRevealSelector.Choose(
+            [FavDocs, HomeDocs, new(@"C:\", false)],
+            @"C:\Users\Dominique\Documents\Work",
+            preferFavorites: true,
+            currentlyInFavorites: false);
+        Assert.Equal(FavDocs, chosen);
+    }
+}