Allow multiple rows of tabs for large projects with lots of files

Hi, I would like to request an improvement to how tabs are displayed once you get a large project and the tabs go past your screen size. Some extra settings for multiple rows of tabs would be great for large multi filed projects. I like splitting up my large projects into more manageable files, but the file count can get high (+20) pretty quickly, so you end up only being able to see half you files on the tab line.

Cheers

Jim

Start by locating the Arduino IDE 1.x code responsible for displaying editor tabs and reproduce the issue with a project containing more than 20 files. Determine how multiple tab rows and any related settings should behave; done means tabs remain accessible across rows without being limited by the screen width.

Written by the indexing model from the issue text.