bugsnag: chain-aware grouping key and chain title in error list - #262
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normalize_error_chain walks __cause__/__context__ and joins each level's normalized string with " <- ". This replaces the single- exception normalize_error_message call used for the grouping key so that "LauncherError <- TimeoutError" and "LauncherError <- ApiException" land in separate, stable groups rather than one per root cause. build_chain_title does the same walk but truncates each level to 80 chars and returns None for single exceptions. _before_notify uses it to override the root-cause errorClass shown in the Bugsnag error list, giving reviewers the full raise path at a glance.
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normalize_error_chainwalks__cause__/__context__and joins each level's normalized string with" <- ". This replaces the single-exceptionnormalize_error_messagecall used for the grouping key so that"LauncherError <- TimeoutError"and"LauncherError <- ApiException"land in separate, stable groups rather than collapsing into one group per root cause.build_chain_titledoes the same walk but truncates each level to 80 chars and returnsNonefor single exceptions._before_notifyuses it to override the root-causeerrorClassthat Bugsnag displays in the error list, giving reviewers the full raise path at a glance without needing to open the stacktrace.