<![CDATA[Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it]]>For years I had no problems with syntax highlighting in a user defined language. A few months ago I had to re-install npp and in v7.9.1 and v7.9.3 I have the following behaviour: for a certain time everything behaves as normal. After a while, seemingly randomly, part of my code is coloured as a comment (code which is not a comment).

Sometimes it is only the line that I am editing, sometimes it is from the cursor to the next /* in my code.

The only remedy I found is exiting npp, restarting it and typically within half an hour the problem reoccurs.

Has anyone experienced the same? Could it be caused by the user defined language?

]]>https://community.notepad-plus-plus.org/topic/20755/syntax-highlighting-works-for-a-time-then-irreproducibly-bleeds-only-restarting-npp-fixes-itRSS for NodeThu, 16 Apr 2026 09:18:06 GMTWed, 17 Feb 2021 15:50:05 GMT60<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Wed, 14 Apr 2021 00:02:27 GMT]]>Since experimenting further with the AutohotKey UDL I have found that this syntax “bleeding” can be limited / minimised / corrected by adding a space to the end of lines (I normally am a heavy user of tabs) especially those lines which seem to end a certain type of highlighting e.g. comments or lines with delimited strings in them.

I also made another discovery, that a tab can be used as a delimiter in UDL. You can enter it by pressing Control+Tab between 2 spaces e.g. ((space tab space EOL)).

]]>https://community.notepad-plus-plus.org/post/64949https://community.notepad-plus-plus.org/post/64949Wed, 14 Apr 2021 00:02:27 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Mon, 22 Feb 2021 23:50:29 GMT]]>Well I sympathize with you, my AutoHotkey folding was all over the place as well as the original issue and so I tried a few random things without much success BUT I did have some improvement / success with doing 2 last things:

  1. moving my userDefinedLang.xml file from …AppData\Roaming\Notepad++\ (I think - although it could have been in C:\Program Files\Notepad++) to …AppData\Roaming\Notepad++\userDefineLangs\ (as well as splitting the individual UDLs into separate files - I had 2 in the original file)
  2. Unselecting “Allow folding in comments” then restarting Notepad++ then Selecting it again.

I haven’t used it enough since to say whether things are cured but here’s hoping.

]]>https://community.notepad-plus-plus.org/post/63141https://community.notepad-plus-plus.org/post/63141Mon, 22 Feb 2021 23:50:29 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Mon, 22 Feb 2021 08:29:54 GMT]]>@El-Greco
Well, using ((EOL)) seems to improve it, but the issue still remains (although the behaviour is slightly different). I wonder, I am using the same UDL as before, with a much older version of npp (v6.x.y, I forgot which one) without ever having this problem. This problem started when I updated to npp v7.9.1 and v7.9.3 behaves the same.
The CTRL+R shortcut is a good one, then at least I can reset the view.

]]>https://community.notepad-plus-plus.org/post/63107https://community.notepad-plus-plus.org/post/63107Mon, 22 Feb 2021 08:29:54 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Thu, 18 Feb 2021 09:09:58 GMT]]>@ludamo-0
Very interesting suggestion, I have implemented it and so far, so good…!
(although according to Murphy’s Law it is dangerous to mention it)
I will try it now for a week and then report about it here.

]]>https://community.notepad-plus-plus.org/post/63026https://community.notepad-plus-plus.org/post/63026Thu, 18 Feb 2021 09:09:58 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Thu, 18 Feb 2021 02:07:40 GMT]]>I have had this problem for a while with AutoHotkey UDL and only recently tried to fix it. Going to the UDL Dialog and inserting ((EOL)) in the Close: box for single line comments seems to have helped - though I have only been using it for a day or two since the change. But you can see in the Notepad++ margin a fold line appear or disappear depending on the setting. Also using (( " EOL )) in the Close: box for text on the Operators & Delimiters tab may also help though I haven’t tried this.
If this all fails I found the Ctrl+R (Reload from Disk) corrected the highlighting.

]]>https://community.notepad-plus-plus.org/post/63024https://community.notepad-plus-plus.org/post/63024Thu, 18 Feb 2021 02:07:40 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Wed, 17 Feb 2021 15:59:56 GMT]]>@El-Greco said in Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it:

Could it be caused by the user defined language?

Yes, of course it could be - maybe a bug/feature!?

]]>https://community.notepad-plus-plus.org/post/63011https://community.notepad-plus-plus.org/post/63011Wed, 17 Feb 2021 15:59:56 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Wed, 17 Feb 2021 15:58:33 GMT]]>@El-Greco

hmm … sorry, obvious question, did the udl change as well?
Mind sharing the UDL and some sample code?

]]>https://community.notepad-plus-plus.org/post/63010https://community.notepad-plus-plus.org/post/63010Wed, 17 Feb 2021 15:58:33 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Wed, 17 Feb 2021 15:56:25 GMT]]>Thanx for the suggestion. I checked it, but it seems that I only use Windows CRLF in my code.

]]>https://community.notepad-plus-plus.org/post/63009https://community.notepad-plus-plus.org/post/63009Wed, 17 Feb 2021 15:56:25 GMT<![CDATA[Reply to Syntax highlighting: works for a time, then (irreproducibly) "bleeds", only restarting npp fixes it on Wed, 17 Feb 2021 15:53:50 GMT]]>@El-Greco

Not exactly as you described, but kind of similar.
For me, the problem was that my code had different EOLs, namely Windows CRLF and Linux LF.
Once I made sure it was the same, I had no more problems.

]]>https://community.notepad-plus-plus.org/post/63008https://community.notepad-plus-plus.org/post/63008Wed, 17 Feb 2021 15:53:50 GMT