[Workspace model] Dispose modifiable model without libraries to remove

GitOrigin-RevId: 84abeee4291685ddfa755705aa3896cef211472e

platform/workspaceModel-ide/src/com/intellij/workspace/legacyBridge/intellij/LegacyBridgeModifiableRootModel.kt

@@ -340,7 +340,7 @@ class LegacyBridgeModifiableRootModel(
     LegacyBridgeModuleRootComponent.getInstance(module).newModuleLibraries.addAll(moduleLibraryTable.librariesToAdd)
     // Do not clear `librariesToAdd`. Otherwise `getLibraries()` will return an empty list after the commit
 
-    dispose()
+    disposeSkippingLibraries()
 
     val moduleDiff = module.diff
 
@@ -365,6 +365,15 @@ class LegacyBridgeModifiableRootModel(
     modelIsCommittedOrDisposed = true
   }
 
+  private fun disposeSkippingLibraries() {
+    if (!modelIsCommittedOrDisposed) {
+      Disposer.dispose(extensionsDisposable)
+    }
+
+    // No assertions here since it is ok to call dispose twice or more
+    modelIsCommittedOrDisposed = true
+  }
+
   override fun getModuleLibraryTable(): LibraryTable = moduleLibraryTable
 
   override fun setSdk(jdk: Sdk?) {