message: fix paste and pristine command in callstack
diff: @@ -102,9 +102,9 @@ class UiState {
  }
  @action.bound pasteFromClipboard(index) {
  - if (this.clipboard && this.selectedTest.test) {
  + if (this.clipboard && this.displayedTest) {
  const newCommand = this.clipboard.clone();
  - this.selectedTest.test.insertCommandAt(newCommand, index);
  + this.displayedTest.insertCommandAt(newCommand, index);
  }
  }
  @@ -278,7 +278,7 @@ class UiState {
  @action.bound observePristine() {
  this.pristineDisposer = observe(this.pristineCommand, () => {
  this.pristineDisposer();
  - this.selectedTest.test.addCommand(this.pristineCommand);
  + this.displayedTest.addCommand(this.pristineCommand);
  this.pristineCommand = new Command();
  this.observePristine();
  });
  