Move the check into setLibrariesFolders()

Author: cmaglie

arduino-core/src/cc/arduino/contributions/libraries/LibrariesIndexer.java

@@ -102,8 +102,10 @@ private void parseIndex(File file) throws IOException {
   }
 
   public void setLibrariesFolders(List<File> _librariesFolders) {
-    librariesFolders = _librariesFolders;
-    rescanLibraries();
+    if (librariesFolders != _librariesFolders && !librariesFolders.equals(_librariesFolders)) {
+      librariesFolders = _librariesFolders;
+      rescanLibraries();
+    }
   }
 
   public List<File> getLibrariesFolders() {

arduino-core/src/processing/app/BaseNoGui.java

@@ -679,9 +679,7 @@ static public void onBoardOrPortChange() {
     // Libraries located in the latest folders on the list can override
     // other libraries with the same name.
     librariesIndexer.setSketchbookLibrariesFolder(getSketchbookLibrariesFolder());
-    if (librariesIndexer.getLibrariesFolders() == null || !librariesIndexer.getLibrariesFolders().equals(librariesFolders)) {
-      librariesIndexer.setLibrariesFolders(librariesFolders);
-    }
+    librariesIndexer.setLibrariesFolders(librariesFolders);
 
     populateImportToLibraryTable();
   }