Merged cells are split

[ivos]

Cells merged in the template are split in the generated output.

template.xls
generated-output.xls

Versions:

<dependency>
	<groupId>org.jxls</groupId>
	<artifactId>jxls</artifactId>
	<version>2.12.0</version>
</dependency>
<dependency>
	<groupId>org.jxls</groupId>
	<artifactId>jxls-poi</artifactId>
	<version>2.12.0</version>
</dependency>
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi</artifactId>
	<version>5.0.0</version>
</dependency>
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
	<version>5.0.0</version>
</dependency>

[SoltauFintel]

Added testcase as PR #299

[SoltauFintel]

Error occurs also in 3.0.0-beta1.

@leonate See Issue259Test. Please fix when you have time. Could be similar to #242 / see PoiTransformer.copyMergedRegions()