Caret · whole device pixels at a device pixel: gpui snapped a 1.5px bar's edges apart, so it painted 1 or 2 pixels by where it stood (#7)

src/primitives/mod.rs

@@ -1,4 +1,5 @@
 mod backdrop;
+mod caret;
 mod disclosure;
 mod divider;
 mod files;
@@ -17,6 +18,7 @@ mod tooltip;
 mod tests;
 
 pub use backdrop::{Backdrop, Place};
+pub(crate) use caret::{caret_bar, caret_width};
 pub use disclosure::Disclosure;
 pub use divider::Divider;
 pub use files::IconTheme;