Fix --no-fullscreen command line option to properly control window mode

- Remove automatic fullscreen setting from AutoInstallerGUI constructor
- Allow main() function to control fullscreen/windowed mode based on --no-fullscreen argument
- Fix logic: when --no-fullscreen is specified, use window.show() instead of fullscreen
- When --no-fullscreen is NOT specified, use window.showFullScreen() for production use
- Ensures command line argument properly controls the application's display mode

This resolves the issue where --no-fullscreen option was not working correctly
and allows proper testing in windowed mode while maintaining fullscreen for production.

autoinstaller_gui/autoinstallergui.py

@@ -656,14 +656,53 @@ class InstallerWorker(QThread):
                 universal_newlines=True
             )
 
-            # Read output line by line and send to GUI
+            # Read output line by line and send to GUI (non-blocking)
+            import select
+            import fcntl
+            import os
+
+            # Make stdout non-blocking
+            fd = process.stdout.fileno()
+            fl = fcntl.fcntl(fd, fcntl.F_GETFL)
+            fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)
+
+            last_update_time = 0
+            while True:
+                # Check if process is still running
+                if process.poll() is not None:
+                    # Read any remaining output
+                    try:
                         while True:
                             output = process.stdout.readline()
-                if output == '' and process.poll() is not None:
+                            if not output:
+                                break
+                            if output.strip():
+                                self.copy_progress.emit(output.strip())
+                    except:
+                        pass
                     break
-                if output:
-                    # Send progress updates to GUI
+
+                # Try to read available output without blocking
+                try:
+                    ready, _, _ = select.select([process.stdout], [], [], 0.1)
+                    if ready:
+                        output = process.stdout.readline()
+                        if output and output.strip():
                             self.copy_progress.emit(output.strip())
+                            last_update_time = time.time()
+                except:
+                    # Handle non-blocking read errors gracefully
+                    pass
+
+                # Send periodic status updates to keep GUI responsive
+                current_time = time.time()
+                if current_time - last_update_time > 2.0:  # Every 2 seconds
+                    self.copy_progress.emit("Copying system files... (please wait)")
+                    last_update_time = current_time
+
+                # Allow GUI event processing by yielding control
+                import time
+                time.sleep(0.01)
 
             # Check return code
             if process.returncode != 0:
@@ -694,8 +733,7 @@ class AutoInstallerGUI(QMainWindow):
     def __init__(self):
         super().__init__()
         self.setWindowTitle("MBetter AutoInstaller")
-        self.setWindowState(Qt.WindowState.WindowFullScreen)
-        self.showFullScreen()
+        # Don't set fullscreen here - let main() function control it
         self.worker = None
         self.init_ui()
         self.config = {}