void (@NotNull Project project, @NotNull ProblemDescriptor descriptor) { final FileEditorManager editorManager = FileEditorManager.getInstance(project); final Editor editor = editorManager.getSelectedTextEditor(); if (editor == null) { return; } final EditorSettings settings = editor.getSettings(); settings.setLeadingWhitespaceShown(true); settings.setWhitespacesShown(!settings.isWhitespacesShown()); editor.getComponent().repaint(); }