[FE - Inspect Page] Don't highlight selecting elements in "inspect-document" section after clicking on the outside bbox

[nikitakovaliov92]

7.18.8-t01-fail-a.pdf

1. Open inspect page with attached PDF
2. Select element in "inspect-document" section
3. Click outside of bbox

Actual result: Element still highlighted
Expected result: No element highlighted

[Resip10]

For now bbox selection cancels on click only on document area. Bbox from the above file fill full page size and it's impossible to click on anywhere except bbox itself.
I can offer two decisions how cancel selection:

• on second click on selected bbox
• click on empty area outside of pdf document

[yuliya-ivaniukovich]

This should be easier when we rewrite bboxes to DIV's so let's postpone and make this after Inspect page is correctly implemented