Comment 1 for bug 1573553

I just tried this with 53,958 files on Ubuntu 15.10 and gtk 2.24.28, but it did not crash. Then I pasted into gedit and confirmed the lines were all there.

Did you have more files than 53K?

Would you please test with another GTK version 2 application on your system? The following is a list of some GTK applications, though some use GTK 3 now

https://en.wikipedia.org/wiki/List_of_GTK%2B_applications

If it helps, I can provide you a test file with many lines to load into a GTK text editor.