Crashed when resizing the window

[belijzajac]

Wanted the duck cursor in my terminal emulator that I'd later replace with an animu girl's head, so I decided to give this project a try. Below are the issues I encountered along the way with the recent binary release:

1. The program crashes when resizing with one of the following error messages: fatal error: sync: unlock of unlocked mutex or panic: runtime error: integer divide by zero
2. There appears to be a random red colored letter t on the right side of the window (???)
3. The gray color in the bottom color thingy shouldn't go all the way to the window's edge
4. The green selection when you click with the left mouse key and drag through text is slow
5. Issues with filenames consisting of chinese & japanese letters