The tmux terminfo extensions Ss and Se are respectively used to switch and reset the cursor style, and were finally made to work in st in commit 8386642, wherein the string "\E[2 q" is used to reset the cursor style.
I don't have a lot of experience with terminfo and escape sequences, but from what I understood of the csihandle() function in st.c, that is equivalent to setting the cursorshape variable to 2 (block), the default value in config.def.h. In my config.h, I set cursorshape to 4 (underline). After starting neovim in st, the cursor style is successfully changed to a block when in normal mode and a vertical bar when in insert mode, but once the process is killed, the cursor becomes a block, not an underline (cursorshape=4) as it should have. Thinking that's a problem with the value of Se in st.info, I manually changed it to "\E[4 q" and rebuilt st. It /didn't/ keep the cursor from becoming a block after closing neovim. `printf '\033[4 q'` does turn the cursor back into an underline, as does `printf '\033[ q'`, which I also tried using as Se to no avail. I tried deleting everything under ~/.terminfo and running tic again, copying the output of tic to /usr/share/terminfo, and even rebooting inbetween changes done to st.info, to rule out problems unknown to me. I'm wondering if this is the fault of st or neovim. Anyone going through the same thing?
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