Program: 75395
Project: 75395
Buggy source:
public void buildUI(Composite parent){
  super.buildUI(parent);
  container.setLayout(WidgetUtil.createGridLayout(5,15));
  IDescriptorProvider dropProvider=new ComboPropertyDescriptorProvider(CellHandle.DROP_PROP,ReportDesignConstants.CELL_ELEMENT);
  IDescriptorProvider backgroundProvider=new ColorPropertyDescriptorProvider(StyleHandle.BACKGROUND_COLOR_PROP,ReportDesignConstants.STYLE_ELEMENT);
  IDescriptorProvider vAlignProvider=new ComboPropertyDescriptorProvider(StyleHandle.VERTICAL_ALIGN_PROP,ReportDesignConstants.STYLE_ELEMENT);
  IDescriptorProvider hAlignProvider=new ComboPropertyDescriptorProvider(StyleHandle.TEXT_ALIGN_PROP,ReportDesignConstants.STYLE_ELEMENT);
  IDescriptorProvider styleProvider=new SimpleComboPropertyDescriptorProvider(ReportItemHandle.STYLE_PROP,ReportDesignConstants.CELL_ELEMENT);
  ComboSection dropSection=new ComboSection(dropProvider.getDisplayName(),container,true);
  ColorSection backgroundSection=new ColorSection(backgroundProvider.getDisplayName(),container,true);
  ComboSection vAlignSection=new ComboSection(vAlignProvider.getDisplayName(),container,true);
  ComboSection hAlignSection=new ComboSection(hAlignProvider.getDisplayName(),container,true);
  Section seperatorSection=new SeperatorSection(container,SWT.HORIZONTAL);
  SimpleComboSection styleSection=new SimpleComboSection(styleProvider.getDisplayName(),container,true);
  dropSection.setProvider(dropProvider);
  backgroundSection.setProvider(backgroundProvider);
  vAlignSection.setProvider(vAlignProvider);
  hAlignSection.setProvider(hAlignProvider);
  styleSection.setProvider(styleProvider);
  dropSection.setWidth(150);
  backgroundSection.setWidth(150);
  vAlignSection.setWidth(150);
  hAlignSection.setWidth(150);
  styleSection.setWidth(150);
  dropSection.setLayoutNum(2);
  backgroundSection.setLayoutNum(3);
  vAlignSection.setLayoutNum(2);
  hAlignSection.setLayoutNum(3);
  styleSection.setLayoutNum(5);
  dropSection.setGridPlaceholder(0,true);
  backgroundSection.setGridPlaceholder(1,true);
  vAlignSection.setGridPlaceholder(0,true);
  hAlignSection.setGridPlaceholder(1,true);
  styleSection.setGridPlaceholder(3,true);
  addSection(PageSectionId.CELL_DROP,dropSection);
  addSection(PageSectionId.CELL_BACKGROUND,backgroundSection);
  addSection(PageSectionId.CELL_VERTICAL_ALIGN,vAlignSection);
  addSection(PageSectionId.CELL_HORIZONTAL_ALIGN,hAlignSection);
  addSection(PageSectionId.CELL_SEPERATOR,seperatorSection);
  addSection(PageSectionId.CELL_STYLE,styleSection);
  createSections();
  layoutSections();
}

Fixed version (ground truth):
public void buildUI(Composite parent){
  super.buildUI(parent);
  container.setLayout(WidgetUtil.createGridLayout(5,15));
  IDescriptorProvider dropProvider=new ComboPropertyDescriptorProvider(CellHandle.DROP_PROP,ReportDesignConstants.CELL_ELEMENT);
  IDescriptorProvider backgroundProvider=new ColorPropertyDescriptorProvider(StyleHandle.BACKGROUND_COLOR_PROP,ReportDesignConstants.STYLE_ELEMENT);
  IDescriptorProvider vAlignProvider=new ComboPropertyDescriptorProvider(StyleHandle.VERTICAL_ALIGN_PROP,ReportDesignConstants.STYLE_ELEMENT);
  IDescriptorProvider hAlignProvider=new ComboPropertyDescriptorProvider(StyleHandle.TEXT_ALIGN_PROP,ReportDesignConstants.STYLE_ELEMENT);
  IDescriptorProvider styleProvider=new SimpleComboPropertyDescriptorProvider(ReportItemHandle.STYLE_PROP,ReportDesignConstants.CELL_ELEMENT);
  ComboSection dropSection=new ComboSection(dropProvider.getDisplayName(),container,true);
  ColorSection backgroundSection=new ColorSection(backgroundProvider.getDisplayName(),container,true);
  ComboSection vAlignSection=new ComboSection(vAlignProvider.getDisplayName(),container,true);
  ComboSection hAlignSection=new ComboSection(hAlignProvider.getDisplayName(),container,true);
  Section seperatorSection=new SeperatorSection(container,SWT.HORIZONTAL);
  SimpleComboSection styleSection=new SimpleComboSection(styleProvider.getDisplayName(),container,true);
  dropSection.setProvider(dropProvider);
  backgroundSection.setProvider(backgroundProvider);
  vAlignSection.setProvider(vAlignProvider);
  hAlignSection.setProvider(hAlignProvider);
  styleSection.setProvider(styleProvider);
  dropSection.setWidth(200);
  backgroundSection.setWidth(200);
  vAlignSection.setWidth(200);
  hAlignSection.setWidth(200);
  styleSection.setWidth(200);
  dropSection.setLayoutNum(2);
  backgroundSection.setLayoutNum(3);
  vAlignSection.setLayoutNum(2);
  hAlignSection.setLayoutNum(3);
  styleSection.setLayoutNum(5);
  dropSection.setGridPlaceholder(0,true);
  backgroundSection.setGridPlaceholder(1,true);
  vAlignSection.setGridPlaceholder(0,true);
  hAlignSection.setGridPlaceholder(1,true);
  styleSection.setGridPlaceholder(3,true);
  addSection(PageSectionId.CELL_DROP,dropSection);
  addSection(PageSectionId.CELL_BACKGROUND,backgroundSection);
  addSection(PageSectionId.CELL_VERTICAL_ALIGN,vAlignSection);
  addSection(PageSectionId.CELL_HORIZONTAL_ALIGN,hAlignSection);
  addSection(PageSectionId.CELL_SEPERATOR,seperatorSection);
  addSection(PageSectionId.CELL_STYLE,styleSection);
  createSections();
  layoutSections();
}