@Lothar-Bongartz ,
I cannot replicate your results. If I take the list that you posted (noticing there are multiple instances of _header and _title that alternate), and I run Edit > Line Operations > Sort Lines Lexicographically Ascending, then I get
CDSRATINGWIDGET689
CDSROWLOGO689
CDSSCROLLINGRAVE
CDSWIDEXCLOGO
CDSWIDWRL
Hangout
SkypeButton
SkypeButton_paraElement
_bol
_bom
_bor
_contact
_cover
_cover
_cover
_cover1
_cover2
_doci
_doci
_email
_fbc
_fbc
_fbd
_fbd
_fbl
_fbls
_fbm
_fbor
_fli
_fli
_go
_go
_good
_good
_grav
_header
_header
_header
_header
_header
_header_100
_icons
_iconsep
_imed
_info_open
_ins
_ins
_link
_link
_link
_map
_map_dir
_mapw
_menu
_mm
_mm
_pan
_panh
_panh
_phone
_photo
_pin
_pin
_pr
_print
_purl
_qr1
_qr1
_qr1
_qr2
_qr2
_qrc
_reviews
_slide
_slids
_soc
_space
_title
_title
_title
_title
_traf
_trip
_trip
_tumblr
_tumblr
_tweets
_tweets
_twid
_twid
_update
_url
_view
_wea
_weads
_weat
_weather
_wel
_wmenu
_yelp
_youl
_your
addc
audioOff
audioOn
currencies
google_translate_element
google_translate_element_100
gplus
modesel-button
modesel-menu
pApprec
pHeader
pLink
pList
pPage
pPlacePic
pQRCode
pRatings
pcover
pcover1
pcover2
pfbd
pgood
pmap
ptwid
q
viewsel
… showing that now, all the underscore words are also properly sorted, with the multiple _headers all adjacent, as they should be.
As Scott asked, what’s your ? > Debug Info ? Mine is
Notepad++ v7.5.8 (32-bit)
Build time : Jul 23 2018 - 02:03:53
Path : C:\Program Files (x86)\Notepad++\notepad++.exe
Admin mode : OFF
Local Conf mode : OFF
OS : Windows 10 (64-bit)
Plugins : ComparePlugin.dll dbgpPlugin.dll DSpellCheck.dll MarkdownViewerPlusPlus.dll NppConverter.dll NppExec.dll NppFTP.dll PluginManager.dll PreviewHTML.dll PythonScript.dll XMLTools.dll mimeTools.dll NppExport.dll