Print failures to the UI

python3/vimspector/debug_adapter_connection.py

@@ -236,6 +236,8 @@ class DebugAdapterConnection( object ):
         self._logger.error( 'Request failed: {0}'.format( reason ) )
         if request.failure_handler:
           request.failure_handler( reason, message )
+        elif 'OnFailure' in dir( self._handler ):
+          self._handler.OnFailure( reason, message )
         else:
           utils.UserMessage( 'Request failed: {0}'.format( reason ) )
     elif message[ 'type' ] == 'event':

python3/vimspector/debug_session.py

@@ -478,6 +478,9 @@ class DebugSession( object ):
     } )
 
 
+  def OnFailure( self, reason, message ):
+    self._outputView.ServerEcho( reason )
+
   def _Launch( self ):
     self._logger.debug( "LAUNCH!" )
     adapter_config = self._adapter

python3/vimspector/output.py

@@ -22,7 +22,7 @@ import json
 BUFFER_MAP = {
   'console': 'Console',
   'stdout': 'Console',
-  'stderr': 'Errors',
+  'stderr': 'stderr',
   'telemetry': 'Telemetry',
 }