Logic tab: "Show all questions" and "Show all action types" buttons jump

[RomanTsukanov]

These buttons change their width to fit the selected question or action name. Because of this, "Show all questions" jumps to the right or left:

https://www.screencast.com/t/mHH5hfGzSFe

To fix this, we can specify a constant width for "Show all action types", and this width should be equal to the width of the longest item.

[mikeamelin]

We're going to consider a search engine for each page.