defaultcursor

This patch makes st interpret cursor 0 as the default cursor.

According to the specification the "Set cursor style (DECSCUSR), VT520." escape sequences define both values of 0 and 1 as a blinking block, with 1 being the default.

Refer to:

https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-Ps-SP-q.1D81

This patch allows the default cursor to be set when value 0 is used, as opposed to setting the cursor to a blinking block.

This allows a command like this to restore the cursor to what st is configured with:

$ echo -ne "\e[ q"

While many terminal emulators do this it is not adhering to specification. xterm is an example terminal that sets a blinking block instead of the configured one, same as st.

Example use case is changing cursor shape in vim depending on what mode is used:

https://vim.fandom.com/wiki/Change_cursor_shape_in_different_modes

https://askubuntu.com/questions/42663/how-to-make-cursor-change-from-thin-line-to-block-based-on-normal-or-insert-mode

The alternative in this case would be to explicitly set the cursor back to what you expect it to be (underline, bar) in the vim configuration.

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• st-default_cursor-0.9-20230207-211964d.diff