Created attachment 119308 [details]
Using a light blue highlight when selecting text or cells that have a white background seems fine, but on other backgrounds, the highlight is barely visible.
Attempt to select the table in the attached document and there isnt much of a difference between when its highlighted and when it isnt, which is bad UX.
Not sure if this should be a bug or an enhancement, so i'll let others decide.
*** This bug has been marked as a duplicate of bug 57894 ***