Word-by-word text selection by mouse fails as soon as the user moves the mouse.

Examples: If a user double clicks on "Lorem" in a "Lorem ipsum" string and then moves the mouse to, say, after the letter "p", the selected text becomes just "Lorem ip", rather than the entirety of both words. If a user double clicks on a word, it becomes entirely highlighted, but if the mouse is moved, the only parts highlighted are the letters between the beginning of the word and the cursor.

The expected behavior is that after the user double clicks, the selection expands/shrinks only word-by-word, with the original selected word always highlighted.

Tested on Chrome on Windows 7.

Version: unspecified
Severity: normal