ncurses dots_termcap example crashes gui

[erlanger]

Describe the bug Running the dots_termcap ncurses example (also dots) and a few others crashes the gui.

Technical information (please complete the following information):

• OS: Linux
• Neovim version: v0.3.2-1059-gfa5182489
• Neovim-Gtk build version: newgrid branch current as of Feb 15. But I think it crashes the main branch also.

Download and compile the official ncurses examples from: https://invisible-island.net/ncurses/ncurses-examples.html

[daa84]

Problem in newgrid branch only. Crash fixed, but still some problems, it takes memory and stop respond, still need more investigation here.

[daa84]

Looks like after some time there is a lot of data come from nvim, also nvim itself come to eat more and more memory.

[erlanger]

Might be a good idea to report to nvim