Program: 91768
Project: 91768
Buggy source:
private void createBuildContextPathGroup(final Composite container){
  final Group buildContextPathLocationGroup=new Group(container,SWT.BORDER);
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.FILL).grab(true,false).applyTo(buildContextPathLocationGroup);
  GridLayoutFactory.fillDefaults().margins(6,6).numColumns(3).applyTo(buildContextPathLocationGroup);
  buildContextPathLocationGroup.setText(LaunchMessages.getString(BUILD_CONTEXT_PATH_LABEL));
  this.buildContextPathText=new Text(buildContextPathLocationGroup,SWT.BORDER);
  this.buildContextPathText.addModifyListener(new LaunchConfigurationChangeListener());
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(true,false).span(3,1).applyTo(this.buildContextPathText);
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(true,false).applyTo(new Label(buildContextPathLocationGroup,SWT.NONE));
  final Button browseWorkspaceButton=new Button(buildContextPathLocationGroup,SWT.NONE);
  browseWorkspaceButton.setText(LaunchMessages.getString(BROWSE_WORKSPACE));
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(false,false).applyTo(browseWorkspaceButton);
  browseWorkspaceButton.addSelectionListener(onBrowseWorkspace(buildContextPathText,buildContextPathWorkspaceRelative,IContainer.class));
  final Button browseFileSystemButton=new Button(buildContextPathLocationGroup,SWT.NONE);
  browseFileSystemButton.setText(LaunchMessages.getString(BROWSE_FILESYSTEM));
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(false,false).applyTo(browseFileSystemButton);
  browseFileSystemButton.addSelectionListener(onBrowseFileSystemForDirectory(this.buildContextPathText,this.buildContextPathWorkspaceRelative));
}

Fixed version (ground truth):
private void createBuildContextPathGroup(final Composite container){
  final Group buildContextPathLocationGroup=new Group(container,SWT.BORDER);
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.FILL).grab(true,false).applyTo(buildContextPathLocationGroup);
  GridLayoutFactory.fillDefaults().margins(6,6).numColumns(3).applyTo(buildContextPathLocationGroup);
  buildContextPathLocationGroup.setText(LaunchMessages.getString(BUILD_CONTEXT_PATH_LABEL));
  this.buildContextPathText=new Text(buildContextPathLocationGroup,SWT.BORDER);
  this.buildContextPathText.addModifyListener(new LaunchConfigurationChangeListener());
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(true,false).span(3,1).applyTo(this.buildContextPathText);
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(true,false).applyTo(new Label(buildContextPathLocationGroup,SWT.NONE));
  final Button browseWorkspaceButton=new Button(buildContextPathLocationGroup,SWT.NONE);
  browseWorkspaceButton.setText(LaunchMessages.getString(BROWSE_WORKSPACE));
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(false,false).applyTo(browseWorkspaceButton);
  browseWorkspaceButton.addSelectionListener(onBrowseWorkspace(buildContextPathText,IContainer.class));
  final Button browseFileSystemButton=new Button(buildContextPathLocationGroup,SWT.NONE);
  browseFileSystemButton.setText(LaunchMessages.getString(BROWSE_FILESYSTEM));
  GridDataFactory.fillDefaults().align(SWT.FILL,SWT.CENTER).grab(false,false).applyTo(browseFileSystemButton);
  browseFileSystemButton.addSelectionListener(onBrowseFileSystemForDirectory(this.buildContextPathText));
}