Constant libnotcurses_sys::NCOPTION_NO_CLEAR_BITMAPS

pub const NCOPTION_NO_CLEAR_BITMAPS: u64 = crate::bindings::ffi::NCOPTION_NO_CLEAR_BITMAPS as u64; // 0x0000_0000_0000_0002u64

Do not try to clear any preexisting bitmaps.

Note that they might still get cleared even if this is set, and they might not get cleared even if this is not set.