Making text fields stretch in two separate subreports - jasper-reports

Question

I have a main subreport, that contains two similar subreports placed next to each other.
These two similar subreports both contain a text field in the detail band. Detail band is set to stretch.
My problem is when one of the text fields contain a long text, and the other is not,there will be a "gap" on side with the short text. The text field with the short text should stretch also.
Is there a way to achive this while maintaining two separate subreports? Or do I have create one subreport from the two, putting both text fields into one subreport?
Here's a simplifeid version of the main subreport, and the two subreport containing the text fields.
Main report:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Invoice" pageWidth="595" pageHeight="255" columnWidth="595" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" resourceBundle="InvoiceBundle" uuid="4328d8a4-e5d5-4d7d-9fba-b42407325799">
<property name="ireport.zoom" value="1.5000000000000007"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="develop trunk"/>
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<style name="table">
<box>
<pen lineWidth="1.0" lineColor="#000000"/>
</box>
</style>
<parameter name="ID" class="java.lang.Long">
<defaultValueExpression><![CDATA[]]></defaultValueExpression>
</parameter>
<parameter name="SUBREPORT_DIR" class="java.lang.String">
<defaultValueExpression><![CDATA["./"]]></defaultValueExpression>
</parameter>
<parameter name="DATEFORMAT" class="java.lang.String"/>
<queryString>
<![CDATA[SELECT 1 -- This is a must, because subreports in Detail Band will only show data if the query has result. TODO: Move this supreport into Header Band.]]>
</queryString>
<detail>
<band height="240" splitType="Stretch">
<frame>
<reportElement style="table" positionType="Float" x="0" y="140" width="555" height="80" uuid="ee798e27-e04b-46e1-ae6b-b85f881d6878"/>
<box>
<topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
</box>
<subreport isUsingCache="false">
<reportElement style="table" positionType="Float" stretchType="RelativeToTallestObject" x="0" y="0" width="300" height="80" uuid="2b946dfa-c599-4ea2-873b-d68073885475"/>
<subreportParameter name="SUBREPORT_DIR">
<subreportParameterExpression><![CDATA[$P{SUBREPORT_DIR}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="REPORT_RESOURCE_BUNDLE">
<subreportParameterExpression><![CDATA[$P{REPORT_RESOURCE_BUNDLE}]]></subreportParameterExpression>
</subreportParameter>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<subreportExpression><![CDATA[$P{SUBREPORT_DIR} + "Left.jasper"]]></subreportExpression>
</subreport>
<subreport isUsingCache="false">
<reportElement style="table" positionType="Float" stretchType="RelativeToTallestObject" x="300" y="0" width="255" height="80" uuid="aa26fd8b-b945-4d61-b3c6-2019f1e2c779"/>
<subreportParameter name="SUBREPORT_DIR">
<subreportParameterExpression><![CDATA[$P{SUBREPORT_DIR}]]></subreportParameterExpression>
</subreportParameter>
<subreportParameter name="REPORT_RESOURCE_BUNDLE">
<subreportParameterExpression><![CDATA[$P{REPORT_RESOURCE_BUNDLE}]]></subreportParameterExpression>
</subreportParameter>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<subreportExpression><![CDATA[$P{SUBREPORT_DIR} + "Right.jasper"]]></subreportExpression>
</subreport>
</frame>
</band>
</detail>
</jasperReport>
Subreport on the left side, called Left.jasper:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Invoice" pageWidth="300" pageHeight="255" columnWidth="300" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" resourceBundle="InvoiceBundle" uuid="4328d8a4-e5d5-4d7d-9fba-b42407325799">
<property name="ireport.zoom" value="1.5000000000000007"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="develop trunk"/>
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<style name="table">
<box>
<pen lineWidth="1.0" lineColor="#000000"/>
</box>
</style>
<parameter name="SUBREPORT_DIR" class="java.lang.String">
<defaultValueExpression><![CDATA[]]></defaultValueExpression>
</parameter>
<parameter name="DATEFORMAT" class="java.lang.String"/>
<queryString>
<![CDATA[SELECT 'this is a short text' AS short_text]]>
</queryString>
<field name="short_text" class="java.lang.String"/>
<detail>
<band height="80" splitType="Stretch">
<frame>
<reportElement style="table" positionType="Float" stretchType="RelativeToTallestObject" x="0" y="0" width="300" height="80" uuid="7688bc26-63fe-4013-b7dc-514f2f078be1"/>
<textField isStretchWithOverflow="true" isBlankWhenNull="true">
<reportElement positionType="Float" stretchType="RelativeToTallestObject" x="5" y="20" width="245" height="15" isPrintWhenDetailOverflows="true" uuid="c71b1e9d-f637-4511-b304-ba5a9603331e"/>
<textElement>
<font fontName="DejaVu Sans" size="9"/>
</textElement>
<textFieldExpression><![CDATA[$F{short_text}]]></textFieldExpression>
</textField>
</frame>
</band>
</detail>
</jasperReport>
Subreport on the right side, called Right.jasper:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Invoice" pageWidth="255" pageHeight="255" columnWidth="255" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" resourceBundle="InvoiceBundle" uuid="4328d8a4-e5d5-4d7d-9fba-b42407325799">
<property name="ireport.zoom" value="1.5000000000000007"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="develop trunk"/>
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<style name="table">
<box>
<pen lineWidth="1.0" lineColor="#000000"/>
</box>
</style>
<parameter name="SUBREPORT_DIR" class="java.lang.String">
<defaultValueExpression><![CDATA[]]></defaultValueExpression>
</parameter>
<queryString>
<![CDATA[select 'This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
This is a very long text, that makes the text field stretch.
' AS long_text]]>
</queryString>
<field name="long_text" class="java.lang.String"/>
<detail>
<band height="80" splitType="Stretch">
<frame>
<reportElement style="table" positionType="Float" stretchType="RelativeToTallestObject" x="0" y="0" width="255" height="80" uuid="9402fe9b-072f-4d99-9686-eaf896fa5281"/>
<textField isStretchWithOverflow="true" isBlankWhenNull="true">
<reportElement positionType="Float" stretchType="RelativeToTallestObject" x="5" y="20" width="250" height="15" isPrintWhenDetailOverflows="true" uuid="cf207ce1-909e-4e80-802b-7b8dcb22f05b"/>
<textElement>
<font fontName="DejaVu Sans" size="9"/>
</textElement>
<textFieldExpression><![CDATA[$F{long_text}]]></textFieldExpression>
</textField>
</frame>
</band>
</detail>
</jasperReport>