Description of the Issue

Autocomplete setting is function autocomplete so that word complete is manually tested. Select the Lua language which is case insensitive. Enter the following into the document.

aab = 1

function AAC()
end

a

Possible word autocomplete list after pressing Ctrl+Enter following the last a :

aab

AAC

AAC
aab

Steps to Reproduce the Issue

1. Position the caret after the last a, press Ctrl+Enter, aab is auto-inserted
2. Undo and remove last a
3. Type A, press Ctrl+Enter, AAC is auto-inserted

Expected Behavior

An autocomplete list displaying

AAC
aab

as case insensitive A is considered the same as a.

This issue causes words expected in the list to be missing in the list.

Actual Behavior

Auto-inserts aab if a is 1st character or auto-inserts AAC if A is 1st character.

Debug Information

Notepad++ v8.4.9   (64-bit)
Build time : Jan 27 2023 - 03:11:16
Path : C:\Notepad++\notepad++.exe
Command Line : 
Admin mode : OFF
Local Conf mode : ON
Cloud Config : OFF
OS Name : Windows 7 Professional (64-bit) 
OS Build : 7601.0
Current ANSI codepage : 1252
Plugins : 
    mimeTools (2.9)
    NppConverter (4.5)
    NppExport (0.4)