Fix runtime errors

crates/ui2/src/lib.rs

@@ -4,7 +4,7 @@ mod components;
 mod element_ext;
 mod elements;
 pub mod prelude;
-mod settings;
+pub mod settings;
 mod static_data;
 mod theme;
 

crates/ui2/src/settings.rs

@@ -1,9 +1,13 @@
 use std::ops::Deref;
 
-use gpui2::{rems, AbsoluteLength, WindowContext};
+use gpui2::{rems, AbsoluteLength, AppContext, WindowContext};
 
 use crate::prelude::*;
 
+pub fn init(cx: &mut AppContext) {
+    cx.set_global(FakeSettings::default());
+}
+
 /// Returns the user settings.
 pub fn user_settings(cx: &WindowContext) -> FakeSettings {
     cx.global::<FakeSettings>().clone()

crates/ui2/src/theme.rs

@@ -137,9 +137,9 @@ where
     E: Element,
     F: FnOnce(&mut ViewContext<E::ViewState>) -> E,
 {
-    cx.default_global::<ThemeStack>().0.push(theme.clone());
+    cx.default_global_mut::<ThemeStack>().0.push(theme.clone());
     let child = build_child(cx);
-    cx.default_global::<ThemeStack>().0.pop();
+    cx.default_global_mut::<ThemeStack>().0.pop();
     Themed { theme, child }
 }
 
@@ -174,9 +174,11 @@ impl<E: Element> Element for Themed<E> {
         element_state: Option<Self::ElementState>,
         cx: &mut ViewContext<Self::ViewState>,
     ) -> Self::ElementState {
-        cx.default_global::<ThemeStack>().0.push(self.theme.clone());
+        cx.default_global_mut::<ThemeStack>()
+            .0
+            .push(self.theme.clone());
         let element_state = self.child.initialize(view_state, element_state, cx);
-        cx.default_global::<ThemeStack>().0.pop();
+        cx.default_global_mut::<ThemeStack>().0.pop();
         element_state
     }
 
@@ -189,9 +191,11 @@ impl<E: Element> Element for Themed<E> {
     where
         Self: Sized,
     {
-        cx.default_global::<ThemeStack>().0.push(self.theme.clone());
+        cx.default_global_mut::<ThemeStack>()
+            .0
+            .push(self.theme.clone());
         let layout_id = self.child.layout(view_state, element_state, cx);
-        cx.default_global::<ThemeStack>().0.pop();
+        cx.default_global_mut::<ThemeStack>().0.pop();
         layout_id
     }
 
@@ -204,9 +208,11 @@ impl<E: Element> Element for Themed<E> {
     ) where
         Self: Sized,
     {
-        cx.default_global::<ThemeStack>().0.push(self.theme.clone());
+        cx.default_global_mut::<ThemeStack>()
+            .0
+            .push(self.theme.clone());
         self.child.paint(bounds, view_state, frame_state, cx);
-        cx.default_global::<ThemeStack>().0.pop();
+        cx.default_global_mut::<ThemeStack>().0.pop();
     }
 }