[rferran]

Hi,
I'm using Sigil 0.9.5 with Qt 5.5.1 running on a Lubuntu 16.04 machine.
The attached epub test file have only 3 lines of text in section0001.xhtml.
First line includes an   entity (non breaking space). Second one have an & entity. And third one have no entities.
When editing text in book view (say, by example, delete or add a space to the third line), the non breaking spaces of the first line are duplicated in the code view. Entity of line 2 is not duplicated.
Toggling to book view, editing something, and returning to code view, duplicates all nbsp entities in xhtml section. Successive changes with toggle views result in an exponentially duplication on this nbsp entities.