I'm on Trusty and just got this same issue with gedit, 95%CPU and slow/no response to typing. This is the first time I got this. I noticed that it only occured when I open gedit via the launcher to create a new document. I then opened gedit by double-clicking an existing textfile and it opened without problem, no heavy CPU load, good response, even for a new empty file. After closing gedit and start via the launcher everything was OK again. But this makes it impossible for me to reproduce the issue and investigate some more.
I'm on Trusty and just got this same issue with gedit, 95%CPU and slow/no response to typing. This is the first time I got this. I noticed that it only occured when I open gedit via the launcher to create a new document. I then opened gedit by double-clicking an existing textfile and it opened without problem, no heavy CPU load, good response, even for a new empty file. After closing gedit and start via the launcher everything was OK again. But this makes it impossible for me to reproduce the issue and investigate some more.