Revert "fix: eliminate blocking calls causing startup freezes and UI hangs"

This reverts commit b2a1046f9d.

portprotonqt/virtual_keyboard.py

@@ -91,41 +91,18 @@ class VirtualKeyboard(QFrame):
         self.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding)
 
     def run_shell_command(self, cmd: str) -> str | None:
-        """Synchronous shell command execution - kept for backward compatibility"""
         process = QProcess(self)
         process.start("sh", ["-c", cmd])
-        # Use a reasonable timeout instead of indefinite wait
-        if process.waitForFinished(5000):  # 5 second timeout
-            if process.exitCode() == 0:
-                output_bytes = process.readAllStandardOutput().data()
-                if isinstance(output_bytes, memoryview):
-                    output_str = output_bytes.tobytes().decode('utf-8').strip()
-                else:
-                    output_str = output_bytes.decode('utf-8').strip()
-                return output_str
-        return None
-
-    def run_shell_command_async(self, cmd: str, callback=None):
-        """
-        Run a shell command asynchronously and optionally call a callback with the result.
-        """
-        def on_process_finished(exit_code, exit_status):
-            if exit_code == 0:
-                output_bytes = process.readAllStandardOutput().data()
-                if isinstance(output_bytes, memoryview):
-                    output_str = output_bytes.tobytes().decode('utf-8').strip()
-                else:
-                    output_str = output_bytes.decode('utf-8').strip()
-                if callback:
-                    callback(output_str)
+        process.waitForFinished(-1)
+        if process.exitCode() == 0:
+            output_bytes = process.readAllStandardOutput().data()
+            if isinstance(output_bytes, memoryview):
+                output_str = output_bytes.tobytes().decode('utf-8').strip()
             else:
-                if callback:
-                    callback(None)
-
-        process = QProcess(self)
-        # Connect the finished signal to handle the result
-        process.finished.connect(on_process_finished)
-        process.start("sh", ["-c", cmd])
+                output_str = output_bytes.decode('utf-8').strip()
+            return output_str
+        else:
+            return None
 
     def get_layouts_setxkbmap(self) -> list[str]:
         """Получаем раскладки, которые используются в системе, возвращаем список вида ['us', 'ru'] и т.п."""