[gnome-boxes] snapshot-list-row: Start machine on revert if prev state was DISPLAY

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 0c42ba6b427a596055d65999a9f5b2f6b1e24b6c
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Thu Oct 23 00:39:49 2014 +0100

    snapshot-list-row: Start machine on revert if prev state was DISPLAY
    
    Its wrong to always override the state of the machine to running after
    reverting to a snapshot. This was only done for the case of user
    entering snapshots view from display so lets ensure that indeed is the
    case before overriding the state of machine.
    
    With this change, libvirt should ensure that after getting reverted to a
    snapshot, machine is back in the state that it was when the snapshot in
    question was taken.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=735688

 src/snapshot-list-row.vala |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/snapshot-list-row.vala b/src/snapshot-list-row.vala
index fa98d8a..2bf579f 100644
--- a/src/snapshot-list-row.vala
+++ b/src/snapshot-list-row.vala
@@ -146,7 +146,9 @@ private class Boxes.SnapshotListRow : Gtk.ListBoxRow {
         if (show_activity)
             activity_message = _("Reverting to %s…").printf (snapshot_name);
 
-        if (snapshot_state == GVirConfig.DomainSnapshotDomainState.SHUTOFF) {
+        if (machine.window.previous_ui_state == UIState.DISPLAY &&
+            snapshot_state == GVirConfig.DomainSnapshotDomainState.SHUTOFF) {
+            // Previous UI state being DISPLAY implies that machine is running
             ulong restart_id = 0;
             restart_id = machine.domain.stopped.connect (() => {
                 machine.start.begin (Machine.ConnectFlags.NONE, null);