This commit improves the handling of message generation interruption in the playground chat interface, ensuring both content and thinking process are properly preserved. Key changes: - Preserve existing content when stopping message generation - Handle both direct reasoningContent and <think> tag formats - Extract and merge thinking process from unclosed <think> tags - Maintain consistent thinking chain format with separators - Auto-collapse reasoning panel after stopping for cleaner UI Technical details: - Modified onStopGenerator to properly handle SSE connection closure - Added regex pattern to extract thinking content from <think> tags - Implemented proper state management for incomplete messages - Ensured all content types are preserved in their respective fields This fix resolves the issue where thinking chain content would be lost when stopping message generation mid-stream.
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