STR 1:
Open Notepad_plus.cpp.
Open the Function List panel.
You get the following state.

Double-click isUrl, edit that function body, save the file and return focus to the FL by clicking on its caption.

Result:
The root Notepad_plus.cpp node is selected.

Expected:
isUrl should be selected.

STR 2:
Open Notepad_plus.cpp.
Open the Function List panel.
Expand the Notepad_plus node.
You get the following state.

Press Sort by Name.
Double-click replaceInFiles, edit that function body, save and return focus to the FL by clicking on its caption.

Result:
The tree is collapsed and the Notepad_plus.cpp node is selected.

Expected:
The tree should retain its expanded state and replaceInFiles should be selected.

Notepad++ v8.1.2 (32-bit)
Build time : Jul 28 2021 - 01:28:03
Path : C:---\notepad++.exe
Command Line :
Admin mode : ON
Local Conf mode : ON
Cloud Config : OFF
OS Name : Windows 10 Enterprise (64-bit)
OS Version : 2009
OS Build : 19042.985
Current ANSI codepage : 1255
Plugins : ComparePlus.dll HTMLTag_unicode.dll MenuIcons.dll PythonScript.dll _CustomizeToolbar.dll