Fix tailssh pixels

protocol/tailscale/tailssh/server.go

@@ -582,11 +582,13 @@ func (s *Server) handleSession(session gliderssh.Session) {
 	session.DisablePTYEmulation()
 	command := session.RawCommand()
 	var term string
-	var rows, cols uint16
+	var rows, cols, widthPixels, heightPixels uint16
 	if isPty {
 		term = ptyReq.Term
 		rows = clampWindowDimension(ptyReq.Window.Height)
 		cols = clampWindowDimension(ptyReq.Window.Width)
+		widthPixels = clampWindowDimension(ptyReq.Window.WidthPixels)
+		heightPixels = clampWindowDimension(ptyReq.Window.HeightPixels)
 	}
 	var rec *recording
 	recorderList, onFailure := recorders(connInfo)
@@ -611,12 +613,14 @@ func (s *Server) handleSession(session gliderssh.Session) {
 		}
 	}
 	shellSession, err := s.backend.OpenSession(shellRequest{
-		User:    localUser,
-		Command: command,
-		Env:     env,
-		Term:    term,
-		Rows:    rows,
-		Cols:    cols,
+		User:         localUser,
+		Command:      command,
+		Env:          env,
+		Term:         term,
+		Rows:         rows,
+		Cols:         cols,
+		WidthPixels:  widthPixels,
+		HeightPixels: heightPixels,
 	})
 	if err != nil {
 		s.logger.Error("failed to open shell session: ", err)
@@ -661,7 +665,12 @@ func (s *Server) handleSession(session gliderssh.Session) {
 			for win := range winCh {
 				shellAccess.Lock()
 				if shellAlive {
-					shellSession.Resize(clampWindowDimension(win.Height), clampWindowDimension(win.Width))
+					shellSession.Resize(
+						clampWindowDimension(win.Height),
+						clampWindowDimension(win.Width),
+						clampWindowDimension(win.WidthPixels),
+						clampWindowDimension(win.HeightPixels),
+					)
 				}
 				shellAccess.Unlock()
 			}