Tab grouping

Description of the Request

So, I have approximately 11 files open always in Notepad++. But on a 1366x768 screen, it is always not good looking.

I don't know when I need a file and I don't even know where the files are. The curent tab position setup is the perfect one for me but it looks cramped. Some files are for code dumping purposes, some for scripts, some for actual coding.

What I am asking is to create a grouping system, with which we can group individual tabs into a single tab with a label/name and clicking on a group's tab opens a small popup that contains the list of files that are in tab. Clicking on one of those items in the popup opens the file, but doesn't create a new tab.

When a file inside the tab is open, the tab's group has the highlight instead of the file's tab. This is better demonstrated with images.
For example, I created a group named Dump with files new 2.txt and new 1. When you click on the group:

When a file tab in the group is open, and I clicked on the group tab:

No source file, test, or entry point is named; start by locating the existing tab-management and tab-rendering code. Review the request and attached examples to define the grouping interaction, then confirm that grouped tabs can display a label, list member files, open a member without duplicating its tab, and show the group as active.