@PeterJones Thanks. Changing the rendering mode to GDI, DirectWrite (retain frames), or DirectWrite (Draw to GDI DC) seems to stop the issue.

Here’s the debug info:
Notepad++ v8.9.1 (ARM 64-bit)
Build time: Jan 18 2026 - 21:12:46
Scintilla/Lexilla included: 5.5.8/5.4.6
Boost Regex included: 1_90
pugixml included: 1.15
nlohmann JSON included: 3.12.0
Path: C:\Program Files\Notepad++\notepad++.exe
Command Line:
Admin mode: OFF
Local Conf mode: OFF
Cloud Config: OFF
Periodic Backup: ON
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)
Dark Mode: OFF
Display Info:
primary monitor: 2304x1536, scaling 150%
visible monitors count: 1
installed Display Class adapters:
0000: Description - Qualcomm® Adreno™ X1-85 GPU
0000: DriverVersion - 31.0.133.2
OS Name: Windows 11 Pro (64-bit)
OS Version: 25H2
OS Build: 26200.7628
Current ANSI codepage: 1252
Plugins:
mimeTools (3.1)
NppConverter (4.7)
NppExport (0.4)

Hi, , @russ-jones, @freemeow, @m-andre-z-eckenrode and All,

Ah… many thanks, @m-andre-z-eckenrode for your valuable input ! Thus, @russ-jones, my macros can be improved as below, just adding a final Esc key stroke :

<Macro name="End Previous NON-Blank chars" Ctrl="no" Alt="yes" Shift="no" Key="190"> <Action type="3" message="1700" wParam="0" lParam="0" sParam="" /> <Action type="3" message="1601" wParam="0" lParam="0" sParam="\S+\K(?=\s)" /> <Action type="3" message="1625" wParam="0" lParam="2" sParam="" /> <Action type="3" message="1602" wParam="0" lParam="0" sParam="" /> <Action type="3" message="1702" wParam="0" lParam="256" sParam="" /> <Action type="3" message="1701" wParam="0" lParam="1" sParam="" /> <Action type="0" message="2325" wParam="0" lParam="0" sParam="" /> </Macro> <Macro name="End Next NON-Blank chars" Ctrl="no" Alt="yes" Shift="no" Key="191"> <Action type="3" message="1700" wParam="0" lParam="0" sParam="" /> <Action type="3" message="1601" wParam="0" lParam="0" sParam="\S+\K(?=\s)" /> <Action type="3" message="1625" wParam="0" lParam="2" sParam="" /> <Action type="3" message="1602" wParam="0" lParam="0" sParam="" /> <Action type="3" message="1702" wParam="0" lParam="768" sParam="" /> <Action type="3" message="1701" wParam="0" lParam="1" sParam="" /> <Action type="0" message="2325" wParam="0" lParam="0" sParam="" /> </Macro>

BR

guy038