[mutter/wip/carlosg/tablet-mapping-fixes: 22/23] backends: Only default to builtin panel on touchscreen devices

[Marge Bot <marge-bot src gnome org>]

commit e3702c8b9a952801f0b0e57e0a5585b4c0efa1cd
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Nov 24 18:34:31 2021 +0100

    backends: Only default to builtin panel on touchscreen devices
    
    Non-display-attached tablets (e.g. Intuos) may find no match, which
    should mean "use the span of all monitors", not "pick one for me".
    Reserve this fallback to touchscreen devices, since these might
    still benefit from it.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2107>

 src/backends/meta-input-mapper.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
---
diff --git a/src/backends/meta-input-mapper.c b/src/backends/meta-input-mapper.c
index 9760bacc2d..a471d18e4b 100644
--- a/src/backends/meta-input-mapper.c
+++ b/src/backends/meta-input-mapper.c
@@ -536,13 +536,17 @@ guess_candidates (MetaInputMapper     *mapper,
 
   if (info->matches->len == 0)
     {
-      DeviceMatch match = { 0 };
+      if (clutter_input_device_get_device_type (input->device) ==
+          CLUTTER_TOUCHSCREEN_DEVICE)
+        {
+          DeviceMatch match = { 0 };
 
-      match.monitor =
-        meta_monitor_manager_get_laptop_panel (mapper->monitor_manager);
+          match.monitor =
+            meta_monitor_manager_get_laptop_panel (mapper->monitor_manager);
 
-      if (match.monitor != NULL)
-        g_array_append_val (info->matches, match);
+          if (match.monitor != NULL)
+            g_array_append_val (info->matches, match);
+        }
 
       info->best = 0;
     }