Geany starts glitch if open a very large text file
File for demonstration: https://drive.google.com/open?id=1xHtXdYx-cUYV0e4yS8PLPILVCcRzfmbG (63.5MB packed size / 2.6 GB unpacked size)
In sublime editor the file opened correctly.
ikhail@localhost ~]$ geany --version geany 1.34.1 (built on 2019-01-05 with GTK 3.24.1, GLib 2.59.0) [mikhail@localhost ~]$ rpm -q geany geany-1.34.1-2.fc30.x86_64
OS: Linux Fedora Rawhide.