nmcli: fixed idempotency issue when config bridge connection (#6105)

* nmcli: fixed idempotency issue when config bridge connection

* Update changelog fragment.

---------

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/3216-nmcli-bridge-idempotency-fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - nmcli - fixed idempotency issue for bridge connections. Module forced default value of ``bridge.priority`` to nmcli if not set; if ``bridge.stp`` is disabled nmcli ignores it and keep default (https://github.com/ansible-collections/community.general/issues/3216, https://github.com/ansible-collections/community.general/issues/4683).

plugins/modules/nmcli.py

@@ -1629,6 +1629,10 @@ class Nmcli(object):
                 'bridge.priority': self.priority,
                 'bridge.stp': self.stp,
             })
+            # priority make sense when stp enabed, otherwise nmcli keeps bridge-priority to 32768 regrdless of input.
+            # force ignoring to save idempotency
+            if self.stp:
+                options.update({'bridge.priority': self.priority})
         elif self.type == 'team':
             options.update({
                 'team.runner': self.runner,