[Github-comments] [geany/geany] Strange bytes suddenly appear in the text (#2066)

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I noticed that sometimes, maybe when moving a line down with alt+page_down, 
strange characters appear. I use geany 1.33 (built on 2018-04-16 with GTK 
3.22.30, GLib 2.56.1) on Lubuntu 18.04.

I managed to take screenshots, with ctrl+z and ctrl+y I could look at the 
changes:
After using ctrl+d to duplicate a line, I tried to move it down.
![2019-01-24-203800_1920x1080_scrot](https://user-images.githubusercontent.com/3192173/51752043-b7206100-20b6-11e9-8bd9-8c33a2644bbc.png)

After pressing alt+page_down to move it down, it looked like this:
![2019-01-24-203802_1920x1080_scrot](https://user-images.githubusercontent.com/3192173/51752066-ce5f4e80-20b6-11e9-8d72-d784afb5e6f7.png)

I pressed alt+page_down multiple times and the characters changed:
![2019-01-24-203735_1920x1080_scrot](https://user-images.githubusercontent.com/3192173/51752101-e8009600-20b6-11e9-95ce-eb79151091b6.png)

I'm not sure if the steps I described above are correct as I can't remember 
such a sudden situation exactly.

I do not know how to reproduce this. Also, geany never crashed when it happened.

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