Problems with print on screen dialog

[b2m]

Environment: Windows 10 with tesseractXplore V0.2.2

• The print on screen dialog somehow has no visible scrollbar.
• When selecting multiple formats only one of them is shown.
• It is not clear that saving results from the "print on screen" dialog they will end up in stdout.
• Selecting PDF as format and using "print on screen" produces an error (see log below) that requires a restart of the application.

[WARNING] stderr: Exception in thread Thread-6:
[WARNING] stderr: Traceback (most recent call last):
[WARNING] stderr:   File "threading.py", line 932, in _bootstrap_inner
[WARNING] stderr:   File "threading.py", line 870, in run
[WARNING] stderr:   File "tesseractXplore\controllers\tesseract_controller.py", line 140, in recognize
[WARNING] stderr:   File "tesseractXplore\recognizer.py", line 60, in recognize
[WARNING] stderr:     stdout = str(stdout.decode("utf-8"))
[WARNING] stderr: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbe in position 530: invalid start byte

[JKamlah]

The only visible scrollbar can atm be applied by a scrollview container and that seems to be buggy. So i implemented the necessary code and i will activate it, if there is a fix to this bug. The multiple formats are getting displayed but all in the one dialog window. Append a hint that it will be stored to stdout storage. The PDF problem is solved.