[mutter] input-mapper: Fix (libwacom) tablet mapping to monitor

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

commit 4b0fd9ab76aa587300cb652e34ca5679db81080e
Author: Christoph Trassl <christoph+qqkrukwkh trassl net>
Date:   Thu Jul 1 06:07:53 2021 +0200

    input-mapper: Fix (libwacom) tablet mapping to monitor
    
    Remove early return when using libwacom, so guess_candidates returns
    monitor candidates for those devices, too.
    
    Additionally, changing the output of an input requires removing the
    input from its current output first.
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1712
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1887>

 src/backends/meta-input-mapper.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/src/backends/meta-input-mapper.c b/src/backends/meta-input-mapper.c
index 2a41a75088..ffbe2dd373 100644
--- a/src/backends/meta-input-mapper.c
+++ b/src/backends/meta-input-mapper.c
@@ -116,6 +116,9 @@ enum
 
 static guint signals[N_SIGNALS] = { 0, };
 
+static void mapper_output_info_remove_input (MetaMapperOutputInfo *output,
+                                             MetaMapperInputInfo  *input);
+
 static void mapper_recalculate_input (MetaInputMapper     *mapper,
                                       MetaMapperInputInfo *input);
 
@@ -166,6 +169,9 @@ settings_output_changed_cb (GSettings           *settings,
                             const char          *key,
                             MetaMapperInputInfo *info)
 {
+  if (info->output != NULL)
+    mapper_output_info_remove_input (info->output, info);
+
   mapper_recalculate_input (info->mapper, info);
 }
 
@@ -492,10 +498,6 @@ guess_candidates (MetaInputMapper     *mapper,
         {
           flags = libwacom_get_integration_flags (wacom_device);
 
-          if ((flags & (WACOM_DEVICE_INTEGRATED_SYSTEM |
-                        WACOM_DEVICE_INTEGRATED_DISPLAY)) == 0)
-            return;
-
           integrated = (flags & (WACOM_DEVICE_INTEGRATED_SYSTEM |
                                  WACOM_DEVICE_INTEGRATED_DISPLAY)) != 0;
           builtin = (flags & WACOM_DEVICE_INTEGRATED_SYSTEM) != 0;