fix: preview could sometimes be incorrectly positioned

src/logic/Window.swift

@@ -97,13 +97,13 @@ class Window {
     func refreshThumbnail(_ screenshot: CGImage) {
         thumbnail = screenshot
         if !App.app.appIsBeingUsed || !shouldShowTheUser { return }
-        if let size,
+        if let position, let size,
            let view = (ThumbnailsView.recycledViews.first { $0.window_?.cgWindowId == cgWindowId }) {
             if !view.thumbnail.isHidden {
                 let thumbnailSize = ThumbnailView.thumbnailSize(screenshot, false)
                 view.thumbnail.updateWithResizedCopy(screenshot, thumbnailSize)
             }
-            App.app.previewPanel.updateImageIfShowing(cgWindowId, screenshot, size)
+            App.app.previewPanel.updateIfShowing(cgWindowId, screenshot, position, size)
         }
     }
 

src/ui/main-window/PreviewPanel.swift

@@ -27,20 +27,10 @@ class PreviewPanel: NSPanel {
         setAccessibilitySubrole(.unknown)
     }
 
-    func updateImageIfShowing(_ id: CGWindowID?,  _ preview: CGImage, _ size: CGSize) {
-        if isVisible && id == currentId {
-            previewView.updateWithResizedCopy(preview, size)
-        }
-    }
-
-    func show(_ id: CGWindowID, _ preview: CGImage, _ position: CGPoint, _ size: CGSize) {
+    func show(_ id: CGWindowID, _ image: CGImage, _ position: CGPoint, _ size: CGSize) {
         if id != currentId {
-            previewView.updateWithResizedCopy(preview, size)
-            var frame = NSRect(origin: position, size: size)
-            // Flip Y coordinate from Quartz (0,0 at bottom-left) to Cocoa coordinates (0,0 at top-left)
-            // Always use the primary screen as reference since all coordinates are relative to it
-            frame.origin.y = NSScreen.screens.first!.frame.maxY - frame.maxY
-            setFrame(frame, display: false)
+            repositionAndResize(position, size)
+            previewView.updateWithResizedCopy(image, size)
         }
         if id != currentId || !isVisible {
             if Preferences.previewFadeInAnimation {
@@ -60,6 +50,21 @@ class PreviewPanel: NSPanel {
             level = NSWindow.Level(rawValue: App.app.thumbnailsPanel.level.rawValue - 1)
         }
     }
+
+    func updateIfShowing(_ id: CGWindowID?,  _ image: CGImage, _ position: CGPoint, _ size: CGSize) {
+        if isVisible && id == currentId {
+            repositionAndResize(position, size)
+            previewView.updateWithResizedCopy(image, size)
+        }
+    }
+
+    private func repositionAndResize( _ position: CGPoint, _ size: CGSize) {
+        var frame = NSRect(origin: position, size: size)
+        // Flip Y coordinate from Quartz (0,0 at bottom-left) to Cocoa coordinates (0,0 at top-left)
+        // Always use the primary screen as reference since all coordinates are relative to it
+        frame.origin.y = NSScreen.screens.first!.frame.maxY - frame.maxY
+        setFrame(frame, display: false)
+    }
 }
 
 private class BorderView: NSView {