src/main/java/com/googlesource/gerrit/plugins/importer/client/ImportGroupScreen.java [109:125]:
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                Button okButton = new Button("OK");
                okButton.addClickHandler(event -> successDialog.hide());

                p.add(okButton);
                successDialog.add(p);

                successDialog.center();
                successDialog.show();
              }

              @Override
              public void onFailure(Throwable caught) {}
            });
  }

  private void clearForm() {
    fromTxt.setValue("");
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src/main/java/com/googlesource/gerrit/plugins/importer/client/ImportProjectScreen.java [117:133]:
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                Button okButton = new Button("OK");
                okButton.addClickHandler(event -> successDialog.hide());

                p.add(okButton);
                successDialog.add(p);

                successDialog.center();
                successDialog.show();
              }

              @Override
              public void onFailure(Throwable caught) {}
            });
  }

  private void clearForm() {
    fromTxt.setValue("");
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