Fix: Persist all data different from default, not just current changes

We need to merge with our current data since we only might get partial data
from our caller.

src/octoprint/plugin/__init__.py

@@ -448,6 +448,18 @@ class PluginSettings(object):
 		return path
 
 	def get_all_data(self, **kwargs):
+		merged = kwargs.get("merged", True)
+		asdict = kwargs.get("asdict", True)
+		defaults = kwargs.get("defaults", self.defaults)
+		preprocessors = kwargs.get("preprocessors", self.get_preprocessors)
+
+		kwargs.update(dict(
+			merged=merged,
+			asdict=asdict,
+			defaults=defaults,
+			preprocessors=preprocessors
+		))
+
 		return self.settings.get(self._prefix_path(), **kwargs)
 
 	def clean_all_data(self):

src/octoprint/plugin/types.py

@@ -1238,12 +1238,17 @@ class SettingsPlugin(OctoPrintPlugin):
 		"""
 		import octoprint.util
 
-		if self.config_version_key in data:
+		# get the current data
-			del data[self.config_version_key]
+		current = self._settings.get_all_data()
+
+		# merge our new data on top of it
+		new_current = octoprint.util.dict_merge(current, data)
+		if self.config_version_key in new_current:
+			del new_current[self.config_version_key]
 
 		# determine diff dict that contains minimal set of changes against the
 		# default settings - we only want to persist that, not everything
-		diff = octoprint.util.dict_diff(self.get_settings_defaults(), data)
+		diff = octoprint.util.dict_diff(self.get_settings_defaults(), new_current)
 
 		version = self.get_settings_version()