Stop insetting apps by the title bar twice

Painting the title bar showed that the window's content view runs the
full height including the bar, so the shell was given a top inset to keep
clear of it. Child webviews were still being offset by the same amount on
top of that, which left a title bar's worth of empty space above every
page.

The shell and a child webview share an origin, so no correction is needed
between them: the shell pads itself, and the rect it reports is already
right. The measurement stays, for that padding only.

src-tauri/src/webviews.rs

@@ -708,7 +708,7 @@ pub fn create(
     window
         .add_child(
             builder,
-            LogicalPosition::new(stage.0, stage.1 + chrome_offset(handle)),
+            LogicalPosition::new(stage.0, stage.1),
             LogicalSize::new(stage.2, stage.3),
         )
         .map_err(|e| e.to_string())?;
@@ -773,7 +773,15 @@ pub fn measure_chrome(_: &AppHandle) -> f64 {
     0.0
 }
 
-/// How far the window's frame sits above its content, in logical pixels.
+/// The title bar's height, for the shell to keep clear of.
+///
+/// Not an offset for positioning apps. The window's content view runs the full
+/// height *including* the title bar, so a child webview and the shell share an
+/// origin and no correction is needed between them — the shell simply pads
+/// itself by this much, and the rect it then reports is already right.
+///
+/// Adding it here as well was the bug that left a title bar's worth of gap
+/// above every page: the inset was being applied twice.
 pub fn chrome_offset(handle: &AppHandle) -> f64 {
     *handle.state::<crate::commands::AppState>().chrome.lock().unwrap()
 }
@@ -800,10 +808,9 @@ pub fn show_only(
     cfg: &Config,
     stage: (f64, f64, f64, f64),
 ) {
-    let top = stage.1 + chrome_offset(handle);
     for app in &cfg.apps {
         let Some(wv) = handle.get_webview(&label_for(&app.id)) else { continue };
-        let _ = wv.set_position(LogicalPosition::new(stage.0, top));
+        let _ = wv.set_position(LogicalPosition::new(stage.0, stage.1));
         let _ = wv.set_size(LogicalSize::new(stage.2, stage.3));
         let _ = wv.set_zoom(app.zoom);
         let _ = wv.show();
@@ -827,10 +834,9 @@ pub fn set_stage(
     radius: f64,
 ) {
     let cfg = handle.state::<crate::commands::AppState>().cfg();
-    let top = stage.1 + chrome_offset(handle);
     for app in &cfg.apps {
         let Some(wv) = handle.get_webview(&label_for(&app.id)) else { continue };
-        let _ = wv.set_position(LogicalPosition::new(stage.0, top));
+        let _ = wv.set_position(LogicalPosition::new(stage.0, stage.1));
         let _ = wv.set_size(LogicalSize::new(stage.2, stage.3));
         set_corner_radius(handle, &app.id, radius);
     }
@@ -848,10 +854,7 @@ pub fn set_stage(
 pub fn hide_all(handle: &AppHandle, cfg: &Config, stage: (f64, f64, f64, f64)) {
     for app in &cfg.apps {
         if let Some(wv) = handle.get_webview(&label_for(&app.id)) {
-            let _ = wv.set_position(LogicalPosition::new(
+            let _ = wv.set_position(LogicalPosition::new(stage.0, stage.1 + PARKED_OFFSET));
-                stage.0,
-                stage.1 + chrome_offset(handle) + PARKED_OFFSET,
-            ));
         }
         // Nothing is on screen behind a dialog, so nothing should think it is.
         set_page_visibility(handle, &app.id, false);