Function generate_new_buffer_name

pub(crate) fn generate_new_buffer_name(
    name: &str,
    ignore: Option<&str>,
) -> String

Return a string that is the name of no existing buffer based on NAME.

If there is no live buffer named NAME, then return NAME. Otherwise modify name by appending <NUMBER>, incrementing NUMBER (starting at 2) until an unused name is found, and then return that name. Optional second argument IGNORE specifies a name that is okay to use (if it is in the sequence to be tried) even if a buffer with that name exists.

If NAME begins with a space (i.e., a buffer that is not normally visible to users), then if buffer NAME already exists a random number is first appended to NAME, to speed up finding a non-existent buffer.