[gnome-flashback] monitor: add scale 1 if no other supported scale was added

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 94da488c51e38377426d2e26dbf6252afd97e14b
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Sep 11 14:12:29 2017 +0800

    monitor: add scale 1 if no other supported scale was added
    
    We currently have a hard coded limit on logical monitor sizes, meant
    for filtering out monitor scales that would result in awkward desktop
    sizes. This has the side effect of also disqualifying scale 1 for
    resolutions that themself are lower than the mentioned limit. To avoid
    listing no supported scales, always add the fallback scale 1 if no
    other was added.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787477

 backends/gf-monitor.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/backends/gf-monitor.c b/backends/gf-monitor.c
index 61d94fd..b6efbe4 100644
--- a/backends/gf-monitor.c
+++ b/backends/gf-monitor.c
@@ -852,6 +852,15 @@ gf_monitor_calculate_supported_scales (GfMonitor                 *monitor,
         }
     }
 
+  if (supported_scales->len == 0)
+    {
+      gfloat fallback_scale;
+
+      fallback_scale = 1.0;
+
+      g_array_append_val (supported_scales, fallback_scale);
+    }
+
   *n_supported_scales = supported_scales->len;
   return (gfloat *) g_array_free (supported_scales, FALSE);
 }