Ensure that stored log lines are sent to sentry if they haven't already been logged

CURA-8760

cura/CrashHandler.py

@@ -12,10 +12,12 @@ import json
 import locale
 from typing import cast, Any
 
+import sentry_sdk
+
 try:
     from sentry_sdk.hub import Hub
     from sentry_sdk.utils import event_from_exception
-    from sentry_sdk import configure_scope
+    from sentry_sdk import configure_scope, add_breadcrumb
     with_sentry_sdk = True
 except ImportError:
     with_sentry_sdk = False
@@ -424,6 +426,13 @@ class CrashHandler:
         if with_sentry_sdk:
             try:
                 hub = Hub.current
+                if not Logger.getLoggers():
+                    # No loggers have been loaded yet, so we don't have any breadcrumbs :(
+                    # So add them manually so we at least have some info...
+                    add_breadcrumb(level = "info", message = "SentryLogging was not initialised yet")
+                    for log_type, line in Logger.getUnloggedLines():
+                        add_breadcrumb(message=line)
+
                 event, hint = event_from_exception((self.exception_type, self.value, self.traceback))
                 hub.capture_event(event, hint=hint)
                 hub.flush()

cura/CuraApplication.py

@@ -777,10 +777,14 @@ class CuraApplication(QtApplication):
             lib_suffixes = {""}
         for suffix in lib_suffixes:
             self._plugin_registry.addPluginLocation(os.path.join(QtApplication.getInstallPrefix(), "lib" + suffix, "cura"))
+
         if not hasattr(sys, "frozen"):
             self._plugin_registry.addPluginLocation(os.path.join(os.path.abspath(os.path.dirname(__file__)), "..", "plugins"))
             self._plugin_registry.preloaded_plugins.append("ConsoleLogger")
 
+        # Since it's possible to get crashes in code before the sentrylogger is loaded, we want to start this plugin
+        # as quickly as possible, as we might get unsolvable crash reports without it.
+        self._plugin_registry.preloaded_plugins.append("SentryLogger")
         self._plugin_registry.loadPlugins()
 
         if self.getBackend() is None:

plugins/SentryLogger/SentryLogger.py

@@ -11,7 +11,6 @@ try:
 except ImportError:
     pass
 from typing import Optional
-import os
 
 
 class SentryLogger(LogOutput):