Fix regression on issue #157
Redo the fix for issue #157 (closed) which is about doing transparent selection for glyphless documents (eg. tesseract scanned documents) because it stopped working after commit 29f32a47
Redo the fix for issue #157 (closed) which is about doing transparent selection for glyphless documents (eg. tesseract scanned documents) because it stopped working after commit 29f32a47