Fixed element screenshots for elements greater then viewport

[martingrossmann]

Description

Additional to PR #374 this change added a check if an element has a location outside the viewport, specially left or top from the viewport. In that case the element's location has negative values.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes