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Description of the Issue

Look at the attached file.

Probably the following are all manifestations of a single bug but:

1 - If viewed with Language>E>ErrorLexer it renders entirely in red despite the first escape sequence appearing halfway into line 2.

2 - NP++ will not delete any text that includes an ANSI escape sequence while in View>Show Symbol>[uncheck all]

3 - While in View>ShowSymbol>ShowAllCharacters, the CR and LF characters following an escape sequence are rendered in the wrong color.

setupWindows.py_shorter.log

Steps To Reproduce

1. Open attached file "setupWindows.py_shorter.log" in NP++.
2. If ErrorList not already selected as Language (it's a .log; should default that way), do Language>E>ErrorList
3. Observe colors
4. Set View>ShowSymbol>[uncheck all] (if not already set)
5. Using mouse, select text that includes an ANSI escape sequence (in this file, these occur just before the string "ERROR::" and at the end of those lines, immediately before the CR LF newline)
6. Press DEL key

Current Behavior

Portions of the file that should be rendered in default foreground color (white for me) render red.

NP++ won't delete text that includes ANSI escape sequences while in mode View>ShowSymbol>[uncheck all].

Oddly, if View>ShowSymbol>ShowAllCharacters is selected, NP++ will delete such text (either with DEL key or by backspacing).

Expected Behavior

Text before any ANSI escape sequences and after [0m (ANSI color reset) should render in default foreground color.

It should be possible to delete text that includes ANSI escape sequences, even when in View>Show Symbol>[uncheck all].

When in View>ShowSymbol>ShowAllCharacters, non-printable characters (like CR and LF) should display in either the usual color or the color selected by the ANSI escape sequence.

Debug Information

Notepad++ v8.8.7   (64-bit)
Build time: Oct 19 2025 - 16:19:15
Scintilla/Lexilla included: 5.5.7/5.4.5
Boost Regex included: 1_85
Path: C:\Program Files\Notepad++\notepad++.exe
Command Line: "C:\Users\lindb\OneDrive\Desktop\setupWindows.py_shorter.log"
Admin mode: OFF
Local Conf mode: OFF
Cloud Config: OFF
Periodic Backup: OFF
Placeholders: OFF
Scintilla Rendering Mode: SC_TECHNOLOGY_DEFAULT (0)
Multi-instance Mode: monoInst
asNotepad: OFF
File Status Auto-Detection: cdEnabledNew (for current file/tab only) + cdAutoUpdate
Dark Mode: OFF
Display Info:
    primary monitor: 7680x2160, scaling 125%
    visible monitors count: 1
    installed Display Class adapters: 
        0000: Description - Intel(R) UHD Graphics 770
        0000: DriverVersion - 32.0.101.7040
        0001: Description - NVIDIA GeForce RTX 2060 SUPER
        0001: DriverVersion - 32.0.15.7688
        0002: Description - NVIDIA GeForce RTX 5070 Ti
        0002: DriverVersion - 32.0.15.7688
OS Name: Windows 11 Pro (64-bit)
OS Version: 25H2
OS Build: 26200.7019
Current ANSI codepage: 1252
Plugins: 
    ConfigUpdater (2.3)
    HexEditor (0.9.14)
    mimeTools (3.1)
    NppConverter (4.7)
    NppExport (0.4)
    NPPJSONViewer (2.1.1)
    _CustomizeToolbar (5.3)

Anything else?

No response