STR:
"Settings -> Preferences -> General -> Localization": select a RTL language (e.g. Hebrew).
Restart NPP.
Enable Ctrl+Tab.
Open some documents.
Ctrl+Tab.

Result:
The Doc Switcher is displayed in LTR layout.

Expected:
The Doc Switcher should be displayed in RTL layout (a simple indication: images on the right).

IDD_VALUE_DLG seems like a typo and should be replaced with IDD_TASKLIST_DLG.

REF:
#13245 (comment)

Notepad++ 8.4.9.