test macOS python update again

.appveyor.yml

@@ -20,7 +20,7 @@ environment:
   # Set the Appveyor Python version for windows, macos and linux here. Does not affect windows_legacy.
   PYTHON_V: 3.11
   # Upgrade to specific version (for platforms supporting upgrade). Upgrade skipped if env var is missing or blank.
-#  PYUPGRADE_V: 3.11.5
+  PYUPGRADE_V: 3.11.5
 
   matrix:
   - job_name: windows_legacy

src/artisanlib/main.py

@@ -17393,7 +17393,7 @@ def settingsLoad(self, filename=None, theme=False, machine=False, redraw=True):
                 # the dpi is set on creating the FigureCanvas
                 try:
                     if self.dpi != toInt(settings.value('dpi',self.dpi)):
-                        self.setdpi(toInt(settings.value('dpi',self.dpi)),moveWindow=True)
+                        self.setdpi(max(40,toInt(settings.value('dpi',self.dpi))),moveWindow=True)
                 except Exception as e: # pylint: disable=broad-except
                     _log.exception(e)
             #restore geometry
@@ -18894,7 +18894,9 @@ def saveAllSettings(self, settings:QSettings, default_settings:Optional[Dict[str
                 self.settingsSetValue(settings, default_settings, 'appearance',self.appearance, read_defaults)
             except Exception: # pylint: disable=broad-except
                 pass
-            self.settingsSetValue(settings, default_settings, 'dpi',self.dpi, read_defaults)
+
+            if not read_defaults:
+                settings.setValue('dpi',self.dpi) # no defaults cache used here to ensure that this one is always writ
 
             self.settingsSetValue(settings, default_settings, 'recentRoasts',self.recentRoasts, read_defaults)