Clearing pipes on creation (#396)

inputremapper/gui/user_interface.py

@@ -472,13 +472,11 @@ class UserInterface:
     @debounce(500)
     def check_on_typing(self, *_):
         """To save latest input from code editor and call syntax check."""
-        print("typing")
         self.editor.gather_changes_and_save()
         self.check_macro_syntax()
 
     def check_macro_syntax(self):
         """Check if the programmed macros are allright."""
-        print("check_macro_syntax")
         self.show_status(CTX_MAPPING, None)
         for key, output in active_preset:
             output = output[0]

inputremapper/ipc/pipe.py

@@ -87,6 +87,12 @@ class Pipe:
 
         self._handles = (open(self._fds[0], "r"), open(self._fds[1], "w"))
 
+        # clear the pipe of any contents, to avoid leftover messages from breaking
+        # the helper
+        while self.poll():
+            leftover = self.recv()
+            logger.debug('Cleared leftover message "%s"', leftover)
+
     def recv(self):
         """Read an object from the pipe or None if nothing available.