[mutter/wip/carlosg/tablet-mapping-fixes: 14/16] backends: Do not emit pointless signals remapping pad devices

[Carlos Garnacho <carlosg src gnome org>]

commit 861eff9d55c13fef9d8b902e80c2c1782633bc67
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Nov 24 18:29:50 2021 +0100

    backends: Do not emit pointless signals remapping pad devices
    
    The matrix and aspect ratio of the tablet is irrelevant on pads, and
    it actually triggers warnings when trying change that on those devices:
    
    gnome-shell:42536): mutter-CRITICAL **: 17:22:41.994: meta_input_device_native_get_mapping_mode_in_impl: 
assertion 'device_type == CLUTTER_TABLET_DEVICE || device_type == CLUTTER_PEN_DEVICE || device_type == 
CLUTTER_ERASER_DEVICE' failed
    
    This is unnecessary to do on pad devices, these just need to be moved
    together with their respective stylus.

 src/backends/meta-input-mapper.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/backends/meta-input-mapper.c b/src/backends/meta-input-mapper.c
index c0a32a3820..9760bacc2d 100644
--- a/src/backends/meta-input-mapper.c
+++ b/src/backends/meta-input-mapper.c
@@ -257,6 +257,10 @@ mapper_input_info_set_output (MetaMapperInputInfo  *input,
 
   input->output = output;
 
+  /* These devices don't require emission about mapping/ratio */
+  if (clutter_input_device_get_device_type (input->device) == CLUTTER_PAD_DEVICE)
+    return;
+
   if (output && monitor)
     {
       meta_monitor_manager_get_monitor_matrix (mapper->monitor_manager,