add sizable trait

crates/theme/src/source/macos.rs

@@ -20,6 +20,10 @@ use crate::system::{AccessibilityPreferences, PartialPalette, SourceKind, System
 
 /// Default control radius for macOS controls.
 const CONTROL_RADIUS_PTS: f32 = 6.0;
+/// The rounded-bezel text field's intrinsic height at regular size.
+const INPUT_HEIGHT_PTS: f32 = 24.0;
+/// The HIG's default body text on macOS is 13 pt (system font size 13 at 1x).
+const ROOT_FONT_SIZE_PTS: f32 = 13.0;
 
 #[derive(Default)]
 pub(crate) struct MacosSource {
@@ -102,6 +106,8 @@ impl ThemeSource for MacosSource {
             accent: Self::color_to_hsla(&NSColor::controlAccentColor()),
             palette,
             control_radius: Some(gpui::px(CONTROL_RADIUS_PTS)),
+            input_height: Some(gpui::px(INPUT_HEIGHT_PTS)),
+            root_font_size: Some(gpui::px(ROOT_FONT_SIZE_PTS)),
             accessibility,
             source: SourceKind::Macos,
         }