Correctly update a list of available JS libraries in usage scope settings

platform/lang-impl/src/com/intellij/ide/scriptingContext/LangScriptingContextConfigurable.java

@@ -76,7 +76,7 @@ public abstract class LangScriptingContextConfigurable implements Configurable,
 
   @Override
   public void reset() {
-    myLibManager.dropChanges();
+    myLibManager.reset();
     myPanel.resetTable();
   }
 

platform/lang-impl/src/com/intellij/ide/scriptingContext/ScriptingLibraryMappings.java

@@ -75,6 +75,7 @@ public class ScriptingLibraryMappings extends LanguagePerFileMappings<ScriptingL
 
   @Override
   public Collection<ScriptingLibraryTable.LibraryModel> getAvailableValues(VirtualFile file) {
+    myLibraryManager.reset();
     List<ScriptingLibraryTable.LibraryModel> libraries = getSingleLibraries();
     if (myCompoundLibMap.containsKey(file)) {
       libraries.add(myCompoundLibMap.get(file));

platform/lang-impl/src/com/intellij/openapi/roots/libraries/scripting/ScriptingLibraryManager.java

@@ -110,7 +110,7 @@ public class ScriptingLibraryManager {
     }
   }
 
-  public void dropChanges() {
+  public void reset() {
     myLibTable = null;
   }