Description of the Issue

I have 43 documents opening in Notepad++ now.
33 on the main (left) view and 10 on the sub (right).

Within the Document List a.k.a. Doc Switcher, I would like a separator (or something like that) between the main and sub file groups for visual organization.

Steps to Reproduce the Issue

Because this isn't an issue, here is just an example situation.

1. Turn on [View] → [Document List]
2. Open many files on the main and sub view
3. Go to each file around the middle of the order on each view
4. In the Document List, try to go to the last file of the main view

... But sometimes the list order goes sub → main.
If that happens, try to find the last of sub instead.

Expected Behavior

The separator indicates the boundary of two views so that you can easily find the desired file.

Actual Behavior

You can't easily find the desired file unless you remember its name or your random clicks hit on it.

Debug Information

• Notepad++ v8.4.7 (64-bit)
• Windows 10 (64-bit)