[client] fix blocking of dozmod during the finale state of a image download

The current thread in DownloadPanel.update() already has a lock on listeners (see TransferTask.fireEvent(..)).
super.update() tiggers an update of the GUI (awt-thread) in which a synchronized block on listeners is also entered, which results in blocking.
Now, in the case event.state == FINISHED, we want to enable the button, which is is done in an awt-thread, which is already blocking.

1 files changed, 4 insertions, 1 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/activity/DownloadPanel.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/activity/DownloadPanel.java
index bdf128e4..a25bd661 100644
--- a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/activity/DownloadPanel.java
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/activity/DownloadPanel.java
@@ -56,10 +56,13 @@ public class DownloadPanel extends TransferPanel implements ActionListener, Quit
 
 	@Override
 	public void update(final TransferEvent event) {
-		super.update(event);
+		// NOTE: the update needs to be done in this order
+		// first enable button than update super class,
+		// else we will trap in a dead lock.
 		if (event.state == TransferState.FINISHED) {
 			btnOpenFolder.setEnabled(true);
 		}
+		super.update(event);
 	}
 
 	@Override