Clearing subscription history for a multi-message list layout only clears the first message list

[blakepercy]

Spy Version = 0.6.0 (beta) Build 51

Clearing subscription history for a multi-message list layout only clears the first message list.

[kamilfb]

Also need to fix the resizing issue and showing all messages when changing number of messages shown.

[kamilfb]

@Silentsaviour, could you try latest beta? http://tinyurl.com/mqtt-spy-download/mqtt-spy-0.6.0-beta-b52-jar-with-dependencies.jar

[blakepercy]

Tested against 0.6.0-beta52 and verified as resolved.