How we delivered more performant and robust task lists in GitLab

GitLab task lists, integrated into areas like issue descriptions and merge requests using GitLab Flavored Markdown, faced performance issues as lists grew longer and more complex, resulting in delayed checkbox updates and data overwriting when multiple users interacted simultaneously. To address these challenges, GitLab 11.8 introduced enhancements that improved performance and robustness by focusing on updating individual checkboxes rather than the entire markdown, allowing concurrent user interactions without conflict. The frontend was adjusted to pass specific task data to the backend, which verified the task's existence and updated the cached HTML directly using the SOURCEPOS flag, thus avoiding markdown re-rendering. Despite not achieving instant updates, disabling checkboxes during requests further ensured data integrity and enhanced user satisfaction. These improvements were spearheaded by Brett Walker on the backend and Fatih Acet on the frontend, leading to a more efficient and reliable task list experience.

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