MCP tweaks

- Skip calls with empty command.
- Set AutoCR on ios_system commands.
- Improvements to close cmdStream sessions

Sessions/MCPSession.m

@@ -194,15 +194,12 @@ - (BOOL)_runCommand:(NSString *)cmdline skipHistoryRecord: (BOOL) skipHistoryRec
     [self _runSSHWithArgs:cmdline];
   } else if ([cmd isEqualToString:@"ssh-copy-id"]) {
     [self _runSSHCopyIDWithArgs:cmdline];
-  } else {
+  } else if (![cmd isEqualToString:@""]) {
     // Manually set raw mode for some commands, as we cannot receive control any other way.
+    [_device closeReadline];
     if ([cmd isEqualToString:@"less"] || [cmd isEqualToString:@"vim"]) {
       self.device.rawMode = true;
-      if ([cmd isEqualToString:@"less"]) {
-        // Less needs a different carriage return.
-        // This is part of the control by apps that we need to define manually.
-        self.device.autoCR = TRUE;
-      }
+      self.device.autoCR = TRUE;
     }
     [self setActiveSession];
     _currentCmd = cmdline;
@@ -219,7 +216,8 @@ - (BOOL)_runCommand:(NSString *)cmdline skipHistoryRecord: (BOOL) skipHistoryRec
     _currentCmd = nil;
     ios_waitpid(_pid);
     ios_releaseThreadId(_pid);
-
+    self.device.autoCR = FALSE;
+
     fclose(tty);
     tty = nil;
     [_cmdStream close];
@@ -340,7 +338,7 @@ - (void)kill
     return;
   } else if (_childSession) {
     [_childSession kill];
-  } else { 
+  } else if (_cmdStream) {
     [self setActiveSession];
     ios_kill();
   }
@@ -374,6 +372,11 @@ - (void)handleControl:(NSString *)control
     if ([control isEqualToString:ctrlD]) {
       // We give a chance to the session to capture the new stdin, as it may have changed.
       [self setActiveSession];
+      if (_cmdStream != NULL) {
+        [_cmdStream close];
+        _cmdStream = NULL;
+        _cmdStream = [_device.stream duplicate];
+      }
       ios_setStreams(_cmdStream.in, _cmdStream.out, _cmdStream.out);
       return;
     }
@@ -390,6 +393,7 @@ - (void)handleControl:(NSString *)control
           [_tokioSignals signalCtrlC];
           _tokioSignals = nil;
         } else {
+          [self setActiveSession];
           ios_kill();
         }
       }