Bug 73027 [Dialogs] Buttons are too high
I20040831 Buttons are no longer oval but have a rounded rectangle shape (see first screenshot). The second screenshot shows how buttons using the small system font should look like.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/StringButtonFieldEditor.java
* the currently displayed value remains.
     * </p>
     *
     * @return the new string to display, or <code>null</code> to leave the
     *  old string showing
     */
    protected abstract String changePressed();
    /* (non-Javadoc)
     * Method declared on StringFieldEditor (and FieldEditor).
     */
    protected void doFillIntoGrid(Composite parent, int numColumns) {
        super.doFillIntoGrid(parent, numColumns - 1);
        changeButton = getChangeControl(parent);
        GridData gd = new GridData();
        gd.horizontalAlignment = GridData.FILL;
        gd.heightHint = convertVerticalDLUsToPixels(changeButton,
                IDialogConstants.BUTTON_HEIGHT);
        int widthHint = convertHorizontalDLUsToPixels(changeButton,
                IDialogConstants.BUTTON_WIDTH);
        gd.widthHint = Math.max(widthHint, changeButton.computeSize(
                SWT.DEFAULT, SWT.DEFAULT, true).x);
        changeButton.setLayoutData(gd);
    }
    /**
     * Get the change control. Create it in parent if required.
     * @param parent
     * @return Button
     */
    protected Button getChangeControl(Composite parent) {
        if (changeButton == null) {