Line Highlighting and Line Selection with Line Number

[bdbch]

As the title says, I'm missing the feature to select a full line with just clicking on the line number.

[pthiess]

@dominikbiedebach Not sure how easy this would be to do in an extension :) Anyways Nice idea - thank you for bringing it up.

[lkcampbell]

Closing as a dupe of #6187.