Address Copilot review on #1090 MMapDirectory.Map fix

Narrow the ArgumentOutOfRangeException retry filter to
ParamName == "capacity" so unrelated argument errors aren't masked,
and mark the regression test NonParallelizable since it relies on
static counters on MMapDirectory.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: paulirwin

src/Lucene.Net.Tests/Store/TestMultiMMap.cs

@@ -425,7 +425,10 @@ private void AssertChunking(Random random, int chunkSize)
         // stat, causing ArgumentOutOfRangeException (paramName="capacity")
         // with the message "The capacity may not be smaller than the
         // file size."
-        [Test, LuceneNetSpecific, Slow]
+        // NonParallelizable: the retry-path assertion reads static counters on
+        // MMapDirectory, so any other test exercising MMapDirectory in parallel
+        // could skew the observed retry count.
+        [Test, LuceneNetSpecific, Slow, NonParallelizable]
         public void TestOpenInputConcurrentFileExtension_Issue1090()
         {
             var dir = CreateTempDir("testOpenInputConcurrentFileExtension");

src/Lucene.Net/Store/MMapDirectory.cs

@@ -350,7 +350,7 @@ internal virtual ByteBuffer[] Map(MMapIndexInput input, FileStream fc, long offs
                             leaveOpen: true); // LUCENENET: We explicitly dispose the FileStream separately.
                         break;
                     }
-                    catch (ArgumentOutOfRangeException) when (attempt < maxAttempts - 1)
+                    catch (ArgumentOutOfRangeException e) when (e.ParamName == "capacity" && attempt < maxAttempts - 1)
                     {
                         Interlocked.Increment(ref s_capacityRetryCount);
                         capacity = Math.Max(capacity, fc.Length);