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gedit is very slow and/or crashes when opening files with very long lines. Can you fix it?
When designing GtkTextView (the text display widget of gtk+ which gedit uses) the developers had to make a design decision: trading off bad performance and memory use on corner cases like very long lines in exchange for better performance in search operations and full support for UTF-8 text. This is a known limitation of GtkTextView and cannot be fixed. On top of that Pango seems to use a lot of CPU drawing such long lines. This may be fixable, but it isn't easy... Feel free to give it a try. Crashes with long lines are usually due to out-of-memory conditions, but if that's not the case then we would like to know about it.
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I think I've suffered from the long-line issue a lot, and have used leafpad (and am about to try geany) as a more reliable alternative; don't get me wrong: if gedit were reliably stable and would not become UNUSABLE for certain documents, I'd have zero complaints about it...