This is a very annoying limitation for editing some config files, such as mozilla prefs.js. It usually contains lines longer than that.
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        user1251007
        
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        Wang
        
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3 Answers
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            This is a well know "security option", it is configurable:
Go to:
Settings / configure editor / open and save
set line length limit [ 1024 ]
and change 1024

        b3h3m0th
        
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                    3Setting the Line Length Limit to '0' will disable it completely. – dhaumann Nov 07 '13 at 14:58
 
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        If you are against VIM and EMACS (give them a try), there's gnome's alternative Gedit, then theres also the lightweight IDE Geany, and Mousepad, and there are the full fledged IDEs like Ajunta, NetBeans, QTCreator, etc.
        Linuxios
        
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        This problem is nowadays fixed, see https://bugs.kde.org/show_bug.cgi?id=345775
In Kate 19.12.3 from 2019 line with thousands of columns seems to work fine. Though 127 000 column causes lag unlike in for example Geany.
        reducing activity
        
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