Merge pull request #5954 from chrisrueger/5951-try-to-fix-racecondition

synchronize JAREditor.getFolder()

bndtools.jareditor/src/bndtools/jareditor/internal/JARTreePage.java

@@ -132,7 +132,7 @@ void setInput(URI uri) {
 		update();
 	}
 
-	private IFolder getFolder(URI input, IProgressMonitor monitor) throws CoreException {
+	private synchronized IFolder getFolder(URI input, IProgressMonitor monitor) throws CoreException {
 
 		URI full = JarFileSystem.jarf(input, "/")
 			.orElseThrow(IllegalArgumentException::new);