17.10 : Also checking line end when block structure is filtered

src/EditorFeatures/CSharpTest/Structure/MetadataAsSource/InvalidIdentifierStructureTests.cs

@@ -72,6 +72,7 @@ public async Task IdentifierThatLooksLikeCode()
 
         await VerifyBlockSpansAsync(code,
             Region("textspan3", "/* now everything is commented (); ...", autoCollapse: true),
+            Region("textspan2", "hint2", CSharpStructureHelpers.Ellipsis, autoCollapse: false),
             Region("textspan1", "hint1", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
     }
 }

src/EditorFeatures/Test/Structure/StructureTaggerTests.cs

@@ -8,6 +8,7 @@
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Editor.Implementation.Structure;
+using Microsoft.CodeAnalysis.Editor.Shared.Options;
 using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
 using Microsoft.CodeAnalysis.Editor.Tagging;
 using Microsoft.CodeAnalysis.Editor.UnitTests.Workspaces;
@@ -325,6 +326,39 @@ End Sub
             hints.Do(v => v.TextView_TestOnly.Close());
         }
 
+        [WpfFact]
+        [WorkItem("https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2094051")]
+        public async Task IfShouldBeCollapsed()
+        {
+            var code = @"
+    Module Program
+        Sub Main(args As String())
+            Dim str = """"
+            If str.Contains(""foo"") Then
+
+            End If
+        End Sub
+    End Module";
+
+            using var workspace = EditorTestWorkspace.CreateVisualBasic(code, composition: EditorTestCompositions.EditorFeaturesWpf);
+            var tags = await GetTagsFromWorkspaceAsync(workspace);
+            Assert.Collection(tags, programTag =>
+            {
+                Assert.Equal("Module Program", GetHeaderText(programTag));
+                Assert.Equal(8, GetCollapsedHintLineCount(programTag));
+            },
+            mainTag =>
+            {
+                Assert.Equal("Sub Main(args As String())", GetHeaderText(mainTag));
+                Assert.Equal(6, GetCollapsedHintLineCount(mainTag));
+            },
+            IfTag =>
+            {
+                Assert.Equal("If str.Contains(\"foo\") Then", GetHeaderText(IfTag));
+                Assert.Equal(3, GetCollapsedHintLineCount(IfTag));
+            });
+        }
+
 #pragma warning disable CS0618 // Type or member is obsolete
         private static async Task<List<IContainerStructureTag>> GetTagsFromWorkspaceAsync(EditorTestWorkspace workspace)
         {

src/Features/Core/Portable/Structure/Syntax/AbstractBlockStructureProvider.cs

@@ -51,16 +51,19 @@ public override void ProvideBlockStructure(in BlockStructureContext context)
             // We only collapse the "inner" span which has larger start.
             spans.Sort(static (x, y) => y.TextSpan.Start.CompareTo(x.TextSpan.Start));
 
-            var lastAddedLine = -1;
+            var lastAddedLineStart = -1;
+            var lastAddedLineEnd = -1;
             var text = context.SyntaxTree.GetText(context.CancellationToken);
 
             foreach (var span in spans)
             {
-                var line = text.Lines.GetLinePosition(span.TextSpan.Start).Line;
-                if (line == lastAddedLine)
+                var lineStart = text.Lines.GetLinePosition(span.TextSpan.Start).Line;
+                var lineEnd = text.Lines.GetLinePosition(span.TextSpan.End).Line;
+                if (lineStart == lastAddedLineStart && lastAddedLineEnd == lineEnd)
                     continue;
 
-                lastAddedLine = line;
+                lastAddedLineStart = lineStart;
+                lastAddedLineEnd = lineEnd;
                 context.Spans.Add(span);
             }
         }