Description:

When the custom width and height is at around 3400, the interface element is
only showing "<<interface>>" in the interface element box and nothing else in
the resulted .jpg file. The class element seems to be scaled properly.

Repro steps:
- create a uml project
- create a class diagram
- create and name 3 class elements and an interface element
- select one of the classes and the interface elements
- click on the "Export as Image" toolbar button
- from the dialog, select "Custom" and enter "3400" in the text field for
"Height" (the Width will be adjusted automatically)
- select JPEG Image (*.jpg) image type
- enter or select a file location and a file name
- click on OK button to generate the .jpg file
- open and view the resulted jpg file