message: `:marks` should show file name, not line content, for global marks in other files
  Fixes
diff: @@ -19,7 +19,11 @@ class MarkQuickPickItem implements QuickPickItem {
  constructor(vimState: VimState, mark: IMark) {
  this.mark = mark;
  this.label = mark.name;
  + if (mark.editor && mark.editor !== vimState.editor) {
  + this.description = mark.editor.document.fileName;
  + } else {
  this.description = vimState.document.lineAt(mark.position).text.trim();
  + }
  this.detail = `line ${mark.position.line} col ${mark.position.character}`;
  }
  }
  