lst: release trackers on VirtualFile invalidation

Fix issue with duplicated trackers registered in ChangeListWorker,
if one VirtualFile was moved on top of another VirtualFile.

EA-116756 - assert: ChangeListWorker.registerChangeTracker
EA-116749 - assert: ChangeListWorker.unregisterChangeTracker

platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManager.kt

@@ -641,21 +641,37 @@ class LineStatusTrackerManager(
       if (!partialChangeListsEnabled) return
 
       synchronized(LOCK) {
-        if (file.isDirectory) {
-          for (data in trackers.values) {
-            if (VfsUtil.isAncestor(file, data.tracker.virtualFile, false)) {
-              reregisterTrackerInCLM(data)
-            }
-          }
-        }
-        else {
-          val document = fileDocumentManager.getCachedDocument(file) ?: return
-          val data = trackers[document] ?: return
-
+        forEachTrackerUnder(file) { data ->
           reregisterTrackerInCLM(data)
         }
       }
     }
+
+    override fun fileDeleted(event: VirtualFileEvent) {
+      if (!partialChangeListsEnabled) return
+
+      synchronized(LOCK) {
+        forEachTrackerUnder(event.file) { data ->
+          releaseTracker(data.tracker.document)
+        }
+      }
+    }
+
+    private fun forEachTrackerUnder(file: VirtualFile, action: (TrackerData) -> Unit) {
+      if (file.isDirectory) {
+        for (data in trackers.values) {
+          if (VfsUtil.isAncestor(file, data.tracker.virtualFile, false)) {
+            action(data)
+          }
+        }
+      }
+      else {
+        val document = fileDocumentManager.getCachedDocument(file) ?: return
+        val data = trackers[document] ?: return
+
+        action(data)
+      }
+    }
   }
 
   private inner class MyDocumentListener : DocumentListener {

platform/vcs-tests/testSrc/com/intellij/openapi/vcs/LineStatusTrackerManagerTest.kt

@@ -236,6 +236,51 @@ class LineStatusTrackerManagerTest : BaseLineStatusTrackerManagerTest() {
     }
   }
 
+  fun `test tracker when file is moved on top of another file`() {
+    createChangelist("Test #1")
+    createChangelist("Test #2")
+
+    val file1 = addLocalFile(FILE_1, "a_b_c_d_e")
+    val file2 = addLocalFile(FILE_2, "a_b_c_d_e")
+    setBaseVersion(FILE_1, "a1_b_c_d_e1")
+    setBaseVersion(FILE_2, "a1_b_c_d_e1")
+    refreshCLM()
+
+
+    file1.withOpenedEditor {
+      val tracker = file1.tracker as PartialLocalLineStatusTracker
+      lstm.waitUntilBaseContentsLoaded()
+
+      val ranges = tracker.getRanges()!!
+      tracker.moveToChangelist(ranges[0], "Test #2".asListNameToList())
+    }
+
+    file2.withOpenedEditor {
+      val tracker = file2.tracker as PartialLocalLineStatusTracker
+      lstm.waitUntilBaseContentsLoaded()
+
+      val ranges = tracker.getRanges()!!
+      tracker.moveToChangelist(ranges[1], "Test #2".asListNameToList())
+    }
+
+    releaseUnneededTrackers()
+    assertNotNull(file1.tracker)
+    assertNotNull(file2.tracker)
+
+    runWriteAction {
+      file1.delete(this)
+      file2.rename(this, file1.name)
+    }
+    assertNull(file1.tracker)
+
+    refreshCLM()
+    lstm.waitUntilBaseContentsLoaded()
+
+    file2.moveAllChangesTo("Test #1")
+    releaseUnneededTrackers()
+    assertNull(file2.tracker)
+  }
+
   fun `test tracker changes moves - empty tracker`() {
     createChangelist("Test #1")
     createChangelist("Test #2")