Don't update lines on the terminal from a previous operation

When we handle a message that isn't tracked in the "line" map (for
example, one with no ID), clear the line map. This means we won't update
lines that were part of a previous, completed set of operations when
doing something like pull -a. It also has the beneficial side effect
of avoiding terminal glitching in these types of situations, since
messages that don't get tracked in the "line" map cause the count of the
number of lines to get out of sync.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

pkg/jsonmessage/jsonmessage.go

@@ -169,6 +169,12 @@ func DisplayJSONMessagesStream(in io.Reader, out io.Writer, terminalFd uintptr,
 		if jm.ID != "" && (jm.Progress != nil || jm.ProgressMessage != "") {
 			line, ok := ids[jm.ID]
 			if !ok {
+				// NOTE: This approach of using len(id) to
+				// figure out the number of lines of history
+				// only works as long as we clear the history
+				// when we output something that's not
+				// accounted for in the map, such as a line
+				// with no ID.
 				line = len(ids)
 				ids[jm.ID] = line
 				if isTerminal {
@@ -182,6 +188,13 @@ func DisplayJSONMessagesStream(in io.Reader, out io.Writer, terminalFd uintptr,
 				// <ESC>[{diff}A = move cursor up diff rows
 				fmt.Fprintf(out, "%c[%dA", 27, diff)
 			}
+		} else {
+			// When outputting something that isn't progress
+			// output, clear the history of previous lines. We
+			// don't want progress entries from some previous
+			// operation to be updated (for example, pull -a
+			// with multiple tags).
+			ids = make(map[string]int)
 		}
 		err := jm.Display(out, isTerminal)
 		if jm.ID != "" && isTerminal {