Entering two consecutive spaces in the middle of a paragraph causes the cursor to jump to the end of the paragraph.

The issue is reproducible with version 2015.1.401 (and not reproducible with Q3 2014)

Steps to reproduce:
1. Open the following url in IE11, setting the compatibility mode to IE8 (or in real IE8)
2. Type in a short sentence into the Editor
3. Place the cursor in the middle sentence and hit the space bar (or other char inserting button)  twice

Result: The cursor will jumps to the end of the sentence.