Feature request: search form, new checkbox "Accent/Diacritic Match"

Description of the Issue

I propose a new feature (see also this conversation ):
On the search form (for all tab sheets), create a new checkbox
"Accent/Diacritic Match" (see images below
The new flag should work in combination with:

• match case (the current behaviour with Regular Expression ( pattern "[[=e=]]" doesn't Match case )
• Match whole word only
• Backward Direction
• Search mode: Normal and extended
  The new feature should work with all variants of vowels and consonant:s, i.e.:
  e: e è é ë ê
  n: n Ñ
  c: Ç
  L: Ł ƚ

Actual Behavior

The only way to search with accent insensitive is actually to enable "regular expression and substitute every letter with the pattern "[[=e=]]" (i.e. for letter "e")

Debug Information

Notepad++ v8.2 (64-bit)
Build time : Dec 30 2021 - 03:40:42
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : -multiInst
Admin mode : ON
Local Conf mode : OFF
Cloud Config : OFF
OS Name : Windows 10 Home (64-bit)
OS Version : 2009
OS Build : 22000.376
Current ANSI codepage : 1252
Plugins : ComparePlugin.dll mimeTools.dll NppConverter.dll NppExport.dll NppXmlTreeviewPlugin.dll

feature request: form with new flag

current form:

Start with the search form and the linked community discussion to understand the proposed Accent/Diacritic Match behavior. Verify how the existing Normal, extended, and regular-expression modes handle case, whole-word, and backward searches. Done means the new checkbox supports the listed combinations and accent variants, including e/è/é/ë/ê, n/Ñ, c/Ç, and L/Ł/ƚ.