Fix stale tile size after window resize

.changeset/ca7a0a92.md

@@ -0,0 +1,5 @@
+---
+bump: patch
+---
+
+Refresh tile aspect ratio when a window is resized between overlay opens. Previously, resizing a window while the overlay was hidden would leave the next cmd-cmd showing the tile at its old aspect ratio (and capturing the live preview at the old dimensions) until something else added or removed a window.

Sources/cmdcmd/Overlay.swift

@@ -318,8 +318,25 @@ final class Overlay {
         let currentIDs = Set(allTiles.map { CGWindowID($0.scWindow.windowID) })
         let addedIDs = newIDs.subtracting(currentIDs)
         let removedIDs = currentIDs.subtracting(newIDs)
-        guard !addedIDs.isEmpty || !removedIDs.isEmpty else { return }
-        Log.debug("reconcile: +\(addedIDs.count) -\(removedIDs.count) (was \(currentIDs.count), now \(newIDs.count))")
+
+        // Refresh kept tiles' SCWindow so .frame reflects the current size.
+        // Without this, a window resized between prewarm and show keeps a
+        // stale frame and the tile renders at the old aspect ratio.
+        let candidateMap = Dictionary(uniqueKeysWithValues: candidates.map { (CGWindowID($0.windowID), $0) })
+        var resized: [Tile] = []
+        for t in allTiles {
+            let id = CGWindowID(t.scWindow.windowID)
+            guard !removedIDs.contains(id), let fresh = candidateMap[id] else { continue }
+            let oldSize = t.scWindow.frame.size
+            let newSize = fresh.frame.size
+            t.scWindow = fresh
+            if abs(oldSize.width - newSize.width) > 1 || abs(oldSize.height - newSize.height) > 1 {
+                resized.append(t)
+            }
+        }
+
+        guard !addedIDs.isEmpty || !removedIDs.isEmpty || !resized.isEmpty else { return }
+        Log.debug("reconcile: +\(addedIDs.count) -\(removedIDs.count) ~\(resized.count) (was \(currentIDs.count), now \(newIDs.count))")
 
         let added: [Tile] = candidates.compactMap { w -> Tile? in
             let id = CGWindowID(w.windowID)
@@ -382,12 +399,23 @@ final class Overlay {
         }
 
         let live = config.livePreviewsEnabled
-        Task {
-            await withTaskGroup(of: Void.self) { group in
-                for t in added {
-                    group.addTask {
-                        await t.snapshot()
-                        if live { await t.start() }
+        if !added.isEmpty {
+            Task {
+                await withTaskGroup(of: Void.self) { group in
+                    for t in added {
+                        group.addTask {
+                            await t.snapshot()
+                            if live { await t.start() }
+                        }
+                    }
+                }
+            }
+        }
+        if !resized.isEmpty {
+            Task {
+                await withTaskGroup(of: Void.self) { group in
+                    for t in resized {
+                        group.addTask { await t.refreshAfterResize(live: live) }
                     }
                 }
             }

Sources/cmdcmd/Tile.swift

@@ -54,7 +54,7 @@ final class Tile: NSObject, SCStreamOutput, SCStreamDelegate {
         return NSColor(srgbRed: r, green: g, blue: b, alpha: 1)
     }
 
-    let scWindow: SCWindow
+    var scWindow: SCWindow
     let ownerPID: pid_t
     let ignoreKey: String
     let layer: CALayer
@@ -476,6 +476,25 @@ final class Tile: NSObject, SCStreamOutput, SCStreamDelegate {
         try? await s.stopCapture()
     }
 
+    /// Underlying window resized after capture started. Tear down the existing
+    /// stream (its config is fixed at the old dimensions) and rebuild from the
+    /// fresh `scWindow.frame`.
+    func refreshAfterResize(live: Bool) async {
+        if cancelled { return }
+        if let s = stream {
+            self.stream = nil
+            stopWatchdog()
+            try? await s.stopCapture()
+        }
+        if cancelled { return }
+        hasRenderedLiveFrame = false
+        loggedFirstLiveFrame = false
+        await snapshot()
+        if live && !cancelled {
+            await start()
+        }
+    }
+
     func stopSync(group: DispatchGroup) {
         cancelled = true
         suppressFrames = true