A text field with a validator shows in case of error after validation an error mark behind the field and reduce the length of the textfield.

ErrorMarkOK.png

after resizing the window, the length of the text field and the position of the error mark is wrong.

ErrorMarkResize.png

The code for a test case:

Code:
package de.gishmo.errormarkproblemtab.client;


import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootLayoutPanel;
import com.google.gwt.user.client.ui.Widget;
import com.sencha.gxt.core.client.Style.Side;
import com.sencha.gxt.core.client.util.Margins;
import com.sencha.gxt.widget.core.client.ContentPanel;
import com.sencha.gxt.widget.core.client.TabItemConfig;
import com.sencha.gxt.widget.core.client.TabPanel;
import com.sencha.gxt.widget.core.client.container.BorderLayoutContainer;
import com.sencha.gxt.widget.core.client.container.BorderLayoutContainer.BorderLayoutData;
import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer;
import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer.HorizontalLayoutData;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
import com.sencha.gxt.widget.core.client.container.Viewport;
import com.sencha.gxt.widget.core.client.form.FieldLabel;
import com.sencha.gxt.widget.core.client.form.FieldSet;
import com.sencha.gxt.widget.core.client.form.FormPanel;
import com.sencha.gxt.widget.core.client.form.TextField;
import com.sencha.gxt.widget.core.client.form.validator.EmptyValidator;


/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class ErrorMarkProblemTab implements EntryPoint {




/**
   * This is the entry point method.
   */
  public void onModuleLoad() {
    BorderLayoutContainer rootPanel = new BorderLayoutContainer();
    rootPanel.setBorders(true);
    rootPanel.setSize("100%", "100%");


    ContentPanel cpNorth = new ContentPanel();
    cpNorth.setHeadingText("Header");
    cpNorth.add(new Label("Test Fieldset Resize"));
    BorderLayoutData dataNorth = new BorderLayoutData(64);
    dataNorth.setMargins(new Margins(2, 2, 2, 2));
    rootPanel.setNorthWidget(cpNorth, dataNorth);


    ContentPanel cpWest = new ContentPanel();
    cpWest.setHeadingText("Navigation");
    cpWest.add(new Label("West"));
    BorderLayoutData dataWest = new BorderLayoutData(128);
    dataWest.setMargins(new Margins(2, 2, 2, 2));
    rootPanel.setWestWidget(cpWest, dataWest);
    
    BorderLayoutData dataCenter = new BorderLayoutData();
    dataCenter.setMargins(new Margins(2, 2, 2, 2));
    rootPanel.setCenterWidget(this.asWidget(), dataCenter);


    Viewport viewport = new Viewport();
    viewport.add(rootPanel);
    
    RootLayoutPanel.get().add(viewport);
  }
  
  private Widget asWidget() {
// Center-Panel
    ContentPanel contentPanel = new ContentPanel();
    contentPanel.setHeadingText("Center");
    contentPanel.setBorders(false);
    contentPanel.setBodyBorder(false);


// Tab-Panel
    TabPanel tabPanel = new TabPanel();
    tabPanel.setBorders(false);
    tabPanel.setBodyBorder(true);
    tabPanel.setTabScroll(true);
// Portal-Tab (immer vorhanden)
    TabItemConfig tab01 = new TabItemConfig("Tab 01");
    tab01.setClosable(false);
    tab01.setEnabled(true);
    tabPanel.add(this.buildForms01(), tab01);
// Portal-Tab (immer vorhanden)
    TabItemConfig tab02 = new TabItemConfig("Tab 02");
    tab02.setClosable(false);
    tab02.setEnabled(true);
    tabPanel.add(this.buildForms02(), tab02);


    contentPanel.add(tabPanel);


    return contentPanel;
  }


  private FormPanel buildForms01() {
    HorizontalLayoutContainer fieldContainer = new HorizontalLayoutContainer();


    FieldSet fsAnschrift = new FieldSet(){
@Override
      protected void onResize(int width, int height) {
        super.onResize(width, height);
        this.getContainerTarget().setWidth(width-this.getElement().getFrameWidth(Side.LEFT, Side.RIGHT), true);
      }
    };
    fsAnschrift.setCollapsible(false);
    fsAnschrift.setHeadingText("Anschrift");
    fieldContainer.add(fsAnschrift, new HorizontalLayoutData(1, -1, new Margins(4)));
// VerticalPanel fuer die Fields im Fieldset
    VerticalLayoutContainer fcAnschrift = new VerticalLayoutContainer();
    fcAnschrift.setBorders(false);
// Felder
    TextField tf = new TextField();
    tf.addValidator(new EmptyValidator<String>());
    fcAnschrift.add(new FieldLabel(tf, "Name"), new VerticalLayoutData(1, -1));  
    fcAnschrift.add(new FieldLabel(new TextField(), "Plz"), new VerticalLayoutData(1, -1));  
    fcAnschrift.add(new FieldLabel(new TextField(), "Ort"), new VerticalLayoutData(1, -1));  
// FieldSet fuellen ... 
    fsAnschrift.add(fcAnschrift);


// Fuer die Farbe
    BorderLayoutContainer bc = new BorderLayoutContainer();
    bc.setSize("100%", "100%");
    BorderLayoutData bcCenter = new BorderLayoutData();
    bcCenter.setMargins(new Margins(0));
    bc.setCenterWidget(fieldContainer, bcCenter);


    
    FormPanel formPanel = new FormPanel();
    formPanel.add(bc);
    
    return formPanel;
  }


  private FormPanel buildForms02() {
    HorizontalLayoutContainer fieldContainer = new HorizontalLayoutContainer();
    fieldContainer.setBorders(false);


    VerticalLayoutContainer fieldContainerRight = new VerticalLayoutContainer();
    fieldContainerRight.setBorders(false);
      
    FieldSet fsKategorie = new FieldSet(){
@Override
      protected void onResize(int width, int height) {
        super.onResize(width, height);
        this.getContainerTarget().setWidth(width-this.getElement().getFrameWidth(Side.LEFT, Side.RIGHT), true);
      }
    };
    fsKategorie.setCollapsible(false);
    fsKategorie.setHeadingText("Kategorie");
    fieldContainer.add(fsKategorie, new HorizontalLayoutData(1, -1, new Margins(4)));
// VerticalPanel fuer die Fields im Fieldset
    VerticalLayoutContainer fcKategorie = new VerticalLayoutContainer();
    fcKategorie.setBorders(false);
// Felder
    fcKategorie.add(new FieldLabel(new TextField(), "Art"), new VerticalLayoutData(1, -1));  
    fcKategorie.add(new FieldLabel(new TextField(), "Status"), new VerticalLayoutData(1, -1));  
    fcKategorie.add(new FieldLabel(new TextField(), "Referenz"), new VerticalLayoutData(1, -1));  
// FieldSet fuellen ... 
    fsKategorie.add(fcKategorie);
    
// Fuer die Farbe
    BorderLayoutContainer bc = new BorderLayoutContainer();
    bc.setSize("100%", "100%");
    BorderLayoutData bcCenter = new BorderLayoutData();
    bcCenter.setMargins(new Margins(0));
    bc.setCenterWidget(fieldContainer, bcCenter);


    
    FormPanel formPanel = new FormPanel();
    formPanel.add(bc);
    
    return formPanel;
  }


}
This problem was detected in FF 10 on OS X (10.7.3)