Absolute positioning of .qlbt-col-tool doesn't work when the content itself is scrollable

[sirgru]

As seen here: https://jsfiddle.net/rj82yaqb/2/

Instructions:

1. Press Enter until the content is scrolling.
2. Create a table and select a cell.
3. Scroll again.

Result: the table elements stay in place while the content scrolls.

This manifests in another error with Right-Click menu: it should check if there is enough space on screen for it and position itself upwards if not; otherwise it creates another scroll which is problematic.