Action Button percentage width does not use the container width for calculations

[David-Cadmart]

The Action Button PCF has the option to customize the width, either by pixel or percentage, but the button is wrapped around a TooltipHost and thus the width of 100% would not cover the whole column where the control is used. It simply gets the same width of the TooltipHost and the TooltipHost has the default width of the button.

An easy fix could be setting the width to the TooltipHost too.