another fix related to #460

main/SettingGraph.scala

@@ -57,7 +57,7 @@ object Graph
 	// [info]   |
 	// [info]   +-quux
 	def toAscii[A](top: A, children: A => Seq[A], display: A => String): String = {
-		val maxColumn = jline.Terminal.getTerminal.getTerminalWidth - 8
+		val maxColumn = JLine.usingTerminal(_.getTerminalWidth) - 8
 		val twoSpaces = " " + " " // prevent accidentally being converted into a tab
 		def limitLine(s: String): String =
 			if (s.length > maxColumn) s.slice(0, maxColumn - 2) + ".."

util/complete/LineReader.scala

@@ -62,10 +62,16 @@ private object JLine
 			val t = terminal
 			t.synchronized { f(t) }
 		}
-	def createReader() =
+	/** For accessing the JLine Terminal object.
+	* This ensures synchronized access as well as re-enabling echo after getting the Terminal. */
+	def usingTerminal[T](f: jline.Terminal => T): T =
 		withTerminal { t =>
-			val cr = new ConsoleReader
 			t.enableEcho()
+			f(t)
+		}
+	def createReader() =
+		usingTerminal { t =>
+			val cr = new ConsoleReader
 			cr.setBellEnabled(false)
 			cr
 		}