Check current version by signature as well

This prevents multiple versions shown as installed, which might happen if many
repos are used and contain the same versions of some app.

src/org/fdroid/fdroid/AppDetails.java

@@ -118,11 +118,9 @@ public class AppDetails extends ListActivity {
             version.setText(getString(R.string.version) + " " + apk.version
                     + (iscurrent ? "*" : ""));
 
-            // TODO: This will show 'Installed' for all apks with the same
-            // version code, which could be more than one if they come from
-            // different repos or are source/binary from the same one!
             TextView status = (TextView) v.findViewById(R.id.status);
-            if (apk.vercode == app.installedVerCode)
+            if (apk.vercode == app.installedVerCode
+                    && apk.sig.equals(mInstalledSigID))
                 status.setText(getString(R.string.inst));
             else
                 status.setText(getString(R.string.not_inst));