fix restoring paused downloads

core/src/main/groovy/com/muwire/core/Core.groovy

@@ -17,6 +17,7 @@ import com.muwire.core.download.SourceDiscoveredEvent
 import com.muwire.core.download.UIDownloadCancelledEvent
 import com.muwire.core.download.UIDownloadEvent
 import com.muwire.core.download.UIDownloadPausedEvent
+import com.muwire.core.download.UIDownloadResumedEvent
 import com.muwire.core.files.FileDownloadedEvent
 import com.muwire.core.files.FileHashedEvent
 import com.muwire.core.files.FileHasher
@@ -219,6 +220,7 @@ public class Core {
         eventBus.register(UIDownloadCancelledEvent.class, downloadManager)
         eventBus.register(SourceDiscoveredEvent.class, downloadManager)
         eventBus.register(UIDownloadPausedEvent.class, downloadManager)
+        eventBus.register(UIDownloadResumedEvent.class, downloadManager)
                 
         log.info("initializing upload manager")
         UploadManager uploadManager = new UploadManager(eventBus, fileManager, meshManager, downloadManager)

core/src/main/groovy/com/muwire/core/download/DownloadManager.groovy

@@ -94,6 +94,10 @@ public class DownloadManager {
         persistDownloaders()
     }
     
+    public void onUIDownloadResumedEvent(UIDownloadResumedEvent e) {
+        persistDownloaders()
+    }
+    
     void resume(Downloader downloader) {
         executor.execute({downloader.download() as Runnable})
     }
@@ -125,9 +129,10 @@ public class DownloadManager {
                 infoHash, json.pieceSizePow2, connector, destinations, incompletes, pieces)
             if (json.paused != null)
                 downloader.paused = json.paused
+            downloaders.put(infoHash, downloader)
+            downloader.readPieces()
             if (!downloader.paused)
-                downloaders.put(infoHash, downloader)
+                downloader.download()
-            downloader.download()
             eventBus.publish(new DownloadStartedEvent(downloader : downloader))
         }
     }

core/src/main/groovy/com/muwire/core/download/Downloader.groovy

@@ -207,11 +207,12 @@ public class Downloader {
     }
     
     public void resume() {
+        paused = false
+        readPieces()
         destinations.each { destination ->
             def worker = activeWorkers.get(destination)
             if (worker != null) {
                 if (worker.currentState == WorkerState.FINISHED) {
-                    paused = false
                     def newWorker = new DownloadWorker(destination)
                     activeWorkers.put(destination, newWorker)
                     executorService.submit(newWorker)

core/src/main/groovy/com/muwire/core/download/UIDownloadResumedEvent.groovy

@@ -0,0 +1,6 @@
+package com.muwire.core.download
+
+import com.muwire.core.Event
+
+class UIDownloadResumedEvent extends Event {
+}

gui/griffon-app/controllers/com/muwire/gui/MainFrameController.groovy

@@ -18,6 +18,7 @@ import com.muwire.core.download.DownloadStartedEvent
 import com.muwire.core.download.UIDownloadCancelledEvent
 import com.muwire.core.download.UIDownloadEvent
 import com.muwire.core.download.UIDownloadPausedEvent
+import com.muwire.core.download.UIDownloadResumedEvent
 import com.muwire.core.search.QueryEvent
 import com.muwire.core.search.SearchEvent
 import com.muwire.core.trust.TrustEvent
@@ -165,6 +166,7 @@ class MainFrameController {
     void resume() {
         def downloader = model.downloads[selectedDownload()].downloader
         downloader.resume()
+        core.eventBus.publish(new UIDownloadResumedEvent())
     }
     
     @ControllerAction