From 1e003b0e76f8372243f2886a9fb2bf7dbc45016a Mon Sep 17 00:00:00 2001
From: John Hood <cgull@glup.org>
Date: Sat, 24 Oct 2015 16:23:17 -0400
Subject: [PATCH] mosh-server:  skip redundant resize requests

This might reduce redraw activity on window resize, especially for
slow servers.
---
 src/frontend/mosh-server.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/frontend/mosh-server.cc b/src/frontend/mosh-server.cc
index 8d7163b..5a1dbeb 100644
--- a/src/frontend/mosh-server.cc
+++ b/src/frontend/mosh-server.cc
@@ -656,8 +656,13 @@ static void serve( int host_fd, Terminal::Complete &terminal, ServerConnection &
 	    const Parser::Action *action = us.get_action( i );
 	    terminal_to_host += terminal.act( action );
 	    if ( typeid( *action ) == typeid( Parser::Resize ) ) {
+	      /* elide consecutive Resize actions */
+	      if ( i < us.size() - 1 &&
+		   typeid( us.get_action( i + 1 ) ) == typeid( Parser::Resize ) ) {
+		continue;
+	      }
 	      /* tell child process of resize */
-	      const Parser::Resize *res = static_cast<const Parser::Resize *>( us.get_action( i ) );
+	      const Parser::Resize *res = static_cast<const Parser::Resize *>( action );
 	      struct winsize window_size;
 	      if ( ioctl( host_fd, TIOCGWINSZ, &window_size ) < 0 ) {
 		perror( "ioctl TIOCGWINSZ" );