Fix UI font size changes not applying (#25307)

Related to #24857.

Release Notes:

- N/A

crates/assistant/src/inline_assistant.rs

@@ -2227,7 +2227,7 @@ impl PromptEditor {
             },
             font_family: settings.buffer_font.family.clone(),
             font_fallbacks: settings.buffer_font.fallbacks.clone(),
-            font_size: settings.buffer_font_size.into(),
+            font_size: settings.buffer_font_size(cx).into(),
             font_weight: settings.buffer_font.weight,
             line_height: relative(settings.buffer_line_height.value()),
             ..Default::default()

crates/assistant/src/terminal_inline_assistant.rs

@@ -1049,7 +1049,7 @@ impl PromptEditor {
             },
             font_family: settings.buffer_font.family.clone(),
             font_fallbacks: settings.buffer_font.fallbacks.clone(),
-            font_size: settings.buffer_font_size.into(),
+            font_size: settings.buffer_font_size(cx).into(),
             font_weight: settings.buffer_font.weight,
             line_height: relative(settings.buffer_line_height.value()),
             ..Default::default()

crates/assistant2/src/inline_prompt_editor.rs

@@ -56,7 +56,7 @@ impl<T: 'static> EventEmitter<PromptEditorEvent> for PromptEditor<T> {}
 
 impl<T: 'static> Render for PromptEditor<T> {
     fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
-        let ui_font_size = ThemeSettings::get_global(cx).ui_font_size;
+        let ui_font_size = ThemeSettings::get_global(cx).ui_font_size(cx);
         let mut buttons = Vec::new();
 
         let left_gutter_width = match &self.mode {

crates/editor/src/commit_tooltip.rs

@@ -210,7 +210,7 @@ impl Render for CommitTooltip {
             .as_ref()
             .and_then(|details| details.pull_request.clone());
 
-        let ui_font_size = ThemeSettings::get_global(cx).ui_font_size;
+        let ui_font_size = ThemeSettings::get_global(cx).ui_font_size(cx);
         let message_max_height = window.line_height() * 12 + (ui_font_size / 0.4);
 
         tooltip_container(window, cx, move |this, _, cx| {

crates/editor/src/editor_settings_controls.rs

@@ -125,8 +125,7 @@ impl EditableSettingControl for BufferFontSizeControl {
     }
 
     fn read(cx: &App) -> Self::Value {
-        let settings = ThemeSettings::get_global(cx);
+        ThemeSettings::get_global(cx).buffer_font_size(cx)
-        settings.buffer_font_size
     }
 
     fn apply(

crates/editor/src/hover_popover.rs

@@ -339,7 +339,7 @@ fn show_hover(
                         base_text_style.refine(&TextStyleRefinement {
                             font_family: Some(settings.ui_font.family.clone()),
                             font_fallbacks: settings.ui_font.fallbacks.clone(),
-                            font_size: Some(settings.ui_font_size.into()),
+                            font_size: Some(settings.ui_font_size(cx).into()),
                             color: Some(cx.theme().colors().editor_foreground),
                             background_color: Some(gpui::transparent_black()),
 

crates/editor/src/signature_help.rs

@@ -206,7 +206,7 @@ impl Editor {
                             color: cx.theme().colors().text,
                             font_family: settings.buffer_font.family.clone(),
                             font_fallbacks: settings.buffer_font.fallbacks.clone(),
-                            font_size: settings.buffer_font_size.into(),
+                            font_size: settings.buffer_font_size(cx).into(),
                             font_weight: settings.buffer_font.weight,
                             line_height: relative(settings.buffer_line_height.value()),
                             ..Default::default()

crates/git_ui/src/commit_modal.rs

@@ -141,7 +141,7 @@ impl CommitModal {
 
         let settings = ThemeSettings::get_global(cx);
         let line_height = relative(settings.buffer_line_height.value())
-            .to_pixels(settings.buffer_font_size.into(), window.rem_size());
+            .to_pixels(settings.buffer_font_size(cx).into(), window.rem_size());
 
         v_flex()
             .justify_between()

crates/recent_projects/src/ssh_connections.rs

@@ -186,7 +186,7 @@ impl SshPrompt {
         let refinement = TextStyleRefinement {
             font_family: Some(theme.buffer_font.family.clone()),
             font_features: Some(FontFeatures::disable_ligatures()),
-            font_size: Some(theme.buffer_font_size.into()),
+            font_size: Some(theme.buffer_font_size(cx).into()),
             color: Some(cx.theme().colors().editor_foreground),
             background_color: Some(gpui::transparent_black()),
             ..Default::default()

crates/repl/src/notebook/cell.rs

@@ -186,7 +186,7 @@ impl Cell {
 
                     let refinement = TextStyleRefinement {
                         font_family: Some(theme.buffer_font.family.clone()),
-                        font_size: Some(theme.buffer_font_size.into()),
+                        font_size: Some(theme.buffer_font_size(cx).into()),
                         color: Some(cx.theme().colors().editor_foreground),
                         background_color: Some(gpui::transparent_black()),
                         ..Default::default()

crates/repl/src/outputs/table.rs

@@ -94,7 +94,7 @@ impl TableView {
         let text_system = window.text_system();
         let text_style = window.text_style();
         let text_font = ThemeSettings::get_global(cx).buffer_font.clone();
-        let font_size = ThemeSettings::get_global(cx).buffer_font_size;
+        let font_size = ThemeSettings::get_global(cx).buffer_font_size(cx);
         let mut runs = [TextRun {
             len: 0,
             font: text_font,

crates/settings_ui/src/appearance_settings_controls.rs

@@ -239,8 +239,7 @@ impl EditableSettingControl for UiFontSizeControl {
     }
 
     fn read(cx: &App) -> Self::Value {
-        let settings = ThemeSettings::get_global(cx);
+        ThemeSettings::get_global(cx).ui_font_size(cx)
-        settings.ui_font_size
     }
 
     fn apply(

crates/theme/src/settings.rs

@@ -95,13 +95,17 @@ pub struct ThemeSettings {
     /// as well as the size of a [gpui::Rems] unit.
     ///
     /// Changing this will impact the size of all UI elements.
-    pub ui_font_size: Pixels,
+    ///
+    /// Use [ThemeSettings::ui_font_size] to access this.
+    ui_font_size: Pixels,
     /// The font used for UI elements.
     pub ui_font: Font,
     /// The font size used for buffers, and the terminal.
     ///
     /// The terminal font size can be overridden using it's own setting.
-    pub buffer_font_size: Pixels,
+    ///
+    /// Use [ThemeSettings::buffer_font_size] to access this.
+    buffer_font_size: Pixels,
     /// The font used for buffers, and the terminal.
     ///
     /// The terminal font family can be overridden using it's own setting.
@@ -569,6 +573,14 @@ impl ThemeSettings {
         clamp_font_size(font_size)
     }
 
+    /// Returns the UI font size.
+    pub fn ui_font_size(&self, cx: &App) -> Pixels {
+        let font_size = cx
+            .try_global::<AdjustedUiFontSize>()
+            .map_or(self.ui_font_size, |size| size.0);
+        clamp_font_size(font_size)
+    }
+
     // TODO: Rename: `line_height` -> `buffer_line_height`
     /// Returns the buffer's line height.
     pub fn line_height(&self) -> f32 {
@@ -715,14 +727,14 @@ pub fn setup_ui_font(window: &mut Window, cx: &mut App) -> gpui::Font {
 
 /// Gets the adjusted UI font size.
 pub fn get_ui_font_size(cx: &App) -> Pixels {
-    let ui_font_size = ThemeSettings::get_global(cx).ui_font_size;
+    let ui_font_size = ThemeSettings::get_global(cx).ui_font_size(cx);
     cx.try_global::<AdjustedUiFontSize>()
         .map_or(ui_font_size, |adjusted_size| adjusted_size.0)
 }
 
 /// Sets the adjusted UI font size.
 pub fn adjust_ui_font_size(cx: &mut App, mut f: impl FnMut(&mut Pixels)) {
-    let ui_font_size = ThemeSettings::get_global(cx).ui_font_size;
+    let ui_font_size = ThemeSettings::get_global(cx).ui_font_size(cx);
     let mut adjusted_size = cx
         .try_global::<AdjustedUiFontSize>()
         .map_or(ui_font_size, |adjusted_size| adjusted_size.0);

crates/theme/src/theme.rs

@@ -103,9 +103,9 @@ pub fn init(themes_to_load: LoadThemes, cx: &mut App) {
     ThemeSettings::register(cx);
     FontFamilyCache::init_global(cx);
 
-    let mut prev_buffer_font_size = ThemeSettings::get_global(cx).buffer_font_size;
+    let mut prev_buffer_font_size = ThemeSettings::get_global(cx).buffer_font_size(cx);
     cx.observe_global::<SettingsStore>(move |cx| {
-        let buffer_font_size = ThemeSettings::get_global(cx).buffer_font_size;
+        let buffer_font_size = ThemeSettings::get_global(cx).buffer_font_size(cx);
         if buffer_font_size != prev_buffer_font_size {
             prev_buffer_font_size = buffer_font_size;
             reset_buffer_font_size(cx);

crates/ui/src/components/context_menu.rs

@@ -507,7 +507,7 @@ impl ContextMenuItem {
 
 impl Render for ContextMenu {
     fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
-        let ui_font_size = ThemeSettings::get_global(cx).ui_font_size;
+        let ui_font_size = ThemeSettings::get_global(cx).ui_font_size(cx);
 
         let aside = self
             .documentation_aside

crates/ui/src/styles/typography.rs

@@ -140,8 +140,8 @@ impl TextSize {
             Self::Default => rems_from_px(14.),
             Self::Small => rems_from_px(12.),
             Self::XSmall => rems_from_px(10.),
-            Self::Ui => rems_from_px(theme_settings.ui_font_size.into()),
+            Self::Ui => rems_from_px(theme_settings.ui_font_size(cx).into()),
-            Self::Editor => rems_from_px(theme_settings.buffer_font_size.into()),
+            Self::Editor => rems_from_px(theme_settings.buffer_font_size(cx).into()),
         }
     }
 }

crates/ui_macros/src/dynamic_spacing.rs

@@ -157,7 +157,7 @@ pub fn derive_spacing(input: TokenStream) -> TokenStream {
 
             /// Returns the spacing value in pixels.
             pub fn px(&self, cx: &App) -> Pixels {
-                let ui_font_size_f32: f32 = ThemeSettings::get_global(cx).ui_font_size.into();
+                let ui_font_size_f32: f32 = ThemeSettings::get_global(cx).ui_font_size(cx).into();
                 px(ui_font_size_f32 * self.spacing_ratio(cx))
             }
         }

crates/zed/src/zed/linux_prompts.rs

@@ -39,7 +39,7 @@ pub fn fallback_prompt_renderer(
                     let mut base_text_style = window.text_style();
                     base_text_style.refine(&TextStyleRefinement {
                         font_family: Some(settings.ui_font.family.clone()),
-                        font_size: Some(settings.ui_font_size.into()),
+                        font_size: Some(settings.ui_font_size(cx).into()),
                         color: Some(ui::Color::Muted.color(cx)),
                         ..Default::default()
                     });