fix: smooth terminal font zooming using scroll accumulator

src/app/mod.rs

@@ -243,6 +243,7 @@ pub(crate) struct Ashell {
     pub(crate) dark_theme_name: SharedString,
     pub(crate) ui_font_size: f32,
     pub(crate) terminal_font_size: f32,
+    pub(crate) terminal_zoom_accumulator: f32,
     pub(crate) ui_font_family: SharedString,
     pub(crate) terminal_font_family: SharedString,
     pub(crate) tabs: Vec<TerminalTab>,
@@ -585,6 +586,7 @@ impl Ashell {
             dark_theme_name,
             ui_font_size: config.ui_font_size(),
             terminal_font_size: config.terminal_font_size(),
+            terminal_zoom_accumulator: 0.0,
             cursor_style: config.cursor_style(),
             ui_font_family,
             terminal_font_family,

src/terminal/input.rs

@@ -213,7 +213,12 @@ impl Ashell {
             .and_then(|tab| tab.selection_text())
     }
 
-    pub(crate) fn paste_into_terminal(&mut self, text: &str, window: &mut Window, cx: &mut Context<Self>) {
+    pub(crate) fn paste_into_terminal(
+        &mut self,
+        text: &str,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
         let Some(active_id) = self.active_tab.clone() else {
             return;
         };
@@ -481,14 +486,18 @@ impl Ashell {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
-        // Ctrl+scroll → zoom terminal font size
-        if event.modifiers.control {
+        // Platform modifier (Cmd on macOS, Ctrl on Windows/Linux) + scroll → zoom terminal font size
+        if event.modifiers.platform {
             let delta = match event.delta {
-                ScrollDelta::Lines(point) => point.y as f32,
-                ScrollDelta::Pixels(point) => point.y.as_f32() / 100.0,
+                ScrollDelta::Lines(point) => point.y as f32 * 20.0,
+                ScrollDelta::Pixels(point) => point.y.as_f32(),
             };
-            if delta != 0.0 {
-                self.change_terminal_font_size(delta.signum() * 0.5, cx);
+            self.terminal_zoom_accumulator += delta;
+            let step = 20.0;
+            if self.terminal_zoom_accumulator.abs() >= step {
+                let zoom_steps = (self.terminal_zoom_accumulator / step).trunc();
+                self.terminal_zoom_accumulator -= zoom_steps * step;
+                self.change_terminal_font_size(zoom_steps * 0.5, cx);
             }
             window.prevent_default();
             cx.stop_propagation();