Starting comments double chars set as 1 char

Description of the Issue

Double slash are not rendered the same manner when used with UTF8 chars.

Steps to Reproduce the Issue

Use this code in a C-like language : C, C++, java

// $ 	U+0024 	010 0100 	00100100 	24
// £ 	U+00A3 	000 1010 0011 	11000010 10100011 	C2 A3
// И 	U+0418 	100 0001 1000 	11010000 10011000 	D0 98
// ह (Devanagari letter HA) 	U+0939 	0000 1001 0011 1001 	11100000 10100100 10111001 	E0 A4 B9
// € 	U+20AC 	0010 0000 1010 1100 	11100010 10000010 10101100 	E2 82 AC
// 한 	U+D55C 	1101 0101 0101 1100 	11101101 10010101 10011100 	ED 95 9C
// 𐍈 	U+10348 	0 0001 0000 0011 0100 1000 	11110000 10010000 10001101 10001000 	F0 90 8D 88
// Suppl Private Use Area B 	U+1096B3 	1 0000 1001 0110 1011 0011 	11110100 10001001 10011010 10110011 	F4 89 9A B3
// Mình nói tiếng Việt 𨉟呐㗂越, "I speak Vietnamese"

Expected Behavior

All start of lines shall take same width.

Actual Behavior

Some // are collapsed into one. Some are larger than others.

Using Cascadia semibold font, 11 point

L8, 9 and 11 : Display is different, because of ligature of "//". not a big issue. Still why some are "ligated" and others not is a mystery.

Using Cascadia Mono to avoid ligatures, L6 is still collapsing the "//" into one char.

Debug Information

Notepad++ v8.6.5 (64-bit)
Build time : Mar 29 2024 - 17:04:43
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : "C:\Program Files\Notepad++\change.log"
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
Periodic Backup : OFF
OS Name : Windows 10 Pro (64-bit
OS Version : 22H2
OS Build : 19045.4170
Current ANSI codepage : 1252 [still encoding of the file is set to UTF-8]
Plugins :
ComparePlugin (2.0.2)
JsonTools (5.6)
mimeTools (3.1)
nppAutoDetectIndent (2.3)
NppConverter (4.6)
NppExport (0.4)
PlantUmlViewer (1.6.0.10)
XMLTools (3.1.1.13)

Reproduce the provided UTF-8 comment examples in Notepad++ using Cascadia Semibold and Cascadia Mono, comparing the lines with different-width // markers. Investigate the editor's comment rendering, Unicode-width, and font-ligature behavior; done means all line starts render consistently without unintended collapsing.