Log: Tuning select text.
Log: Tuning select text.

Update issue 1689
Tuning:
- Different icon when select-column is hovered.
- Slightly sharper icom.
- Fixed icon disappearing when hovering between columns.

I'll still take a look at toggle functionality. After that this ought to be ready otherwise but needs to be tested more thoroughly.

userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3