Add encoding='utf-8' for text file reading

CURA-4875

When encoding is not provided, the behaviour is system dependent and it
can break on OS X.

cura/CrashHandler.py

@@ -189,7 +189,7 @@ class CrashHandler:
 
             json_metadata_file = os.path.join(directory, "plugin.json")
             try:
-                with open(json_metadata_file, "r") as f:
+                with open(json_metadata_file, "r", encoding = "utf-8") as f:
                     try:
                         metadata = json.loads(f.read())
                         module_version = metadata["version"]
@@ -217,9 +217,9 @@ class CrashHandler:
         text_area = QTextEdit()
         tmp_file_fd, tmp_file_path = tempfile.mkstemp(prefix = "cura-crash", text = True)
         os.close(tmp_file_fd)
-        with open(tmp_file_path, "w") as f:
+        with open(tmp_file_path, "w", encoding = "utf-8") as f:
             faulthandler.dump_traceback(f, all_threads=True)
-        with open(tmp_file_path, "r") as f:
+        with open(tmp_file_path, "r", encoding = "utf-8") as f:
             logdata = f.read()
 
         text_area.setText(logdata)

cura/Settings/ContainerManager.py

@@ -486,7 +486,7 @@ class ContainerManager(QObject):
         container = container_type(container_id)
 
         try:
-            with open(file_url, "rt") as f:
+            with open(file_url, "rt", encoding = "utf-8") as f:
                 container.deserialize(f.read())
         except PermissionError:
             return { "status": "error", "message": "Permission denied when trying to read the file"}

cura/Settings/CuraContainerRegistry.py

@@ -693,7 +693,7 @@ class CuraContainerRegistry(ContainerRegistry):
                     continue
 
                 instance_container = InstanceContainer(container_id)
-                with open(file_path, "r") as f:
+                with open(file_path, "r", encoding = "utf-8") as f:
                     serialized = f.read()
                 instance_container.deserialize(serialized, file_path)
                 self.addContainer(instance_container)

cura_app.py

@@ -30,8 +30,8 @@ if not known_args["debug"]:
     if hasattr(sys, "frozen"):
         dirpath = get_cura_dir_path()
         os.makedirs(dirpath, exist_ok = True)
-        sys.stdout = open(os.path.join(dirpath, "stdout.log"), "w")
-        sys.stderr = open(os.path.join(dirpath, "stderr.log"), "w")
+        sys.stdout = open(os.path.join(dirpath, "stdout.log"), "w", encoding = "utf-8")
+        sys.stderr = open(os.path.join(dirpath, "stderr.log"), "w", encoding = "utf-8")
 
 import platform
 import faulthandler

plugins/CuraProfileReader/CuraProfileReader.py

@@ -39,7 +39,7 @@ class CuraProfileReader(ProfileReader):
 
         except zipfile.BadZipFile:
             # It must be an older profile from Cura 2.1.
-            with open(file_name, encoding="utf-8") as fhandle:
+            with open(file_name, encoding = "utf-8") as fhandle:
                 serialized = fhandle.read()
             return [self._loadProfile(serialized, profile_id) for serialized, profile_id in self._upgradeProfile(serialized, file_name)]
 

plugins/GCodeReader/GCodeReader.py

@@ -26,7 +26,7 @@ class GCodeReader(MeshReader):
 
     # PreRead is used to get the correct flavor. If not, Marlin is set by default
     def preRead(self, file_name, *args, **kwargs):
-        with open(file_name, "r") as file:
+        with open(file_name, "r", encoding = "utf-8") as file:
             for line in file:
                 if line[:len(self._flavor_keyword)] == self._flavor_keyword:
                     try:

plugins/VersionUpgrade/VersionUpgrade22to24/VersionUpgrade.py

@@ -74,7 +74,7 @@ class VersionUpgrade22to24(VersionUpgrade):
     def __convertVariant(self, variant_path):
         # Copy the variant to the machine_instances/*_settings.inst.cfg
         variant_config = configparser.ConfigParser(interpolation=None)
-        with open(variant_path, "r") as fhandle:
+        with open(variant_path, "r", encoding = "utf-8") as fhandle:
             variant_config.read_file(fhandle)
 
         config_name = "Unknown Variant"

plugins/VersionUpgrade/VersionUpgrade30to31/VersionUpgrade30to31.py

@@ -231,5 +231,5 @@ class VersionUpgrade30to31(VersionUpgrade):
 
         quality_changes_dir = Resources.getPath(CuraApplication.ResourceTypes.QualityInstanceContainer)
 
-        with open(os.path.join(quality_changes_dir, extruder_quality_changes_filename), "w") as f:
+        with open(os.path.join(quality_changes_dir, extruder_quality_changes_filename), "w", encoding = "utf-8") as f:
             f.write(extruder_quality_changes_output.getvalue())