collab-staging: markdown: Fix crashes on tab-indented code blocks (#65398)
Executive Summary
Fixes #65320 Key cached highlights by typed event indices instead of source offsets, which can collide during tab expansion. Add a layout regression test covering the crash and related edge cases. Release Notes: Fixed crashes on tab-indented code blocks
Client Application & User-Space Architecture
From a desktop application, client performance, and user-space engineering perspective: - **Local-First Computation:** Workloads prioritize client-side execution, eliminating mandatory surveillance telemetry. - **Cross-Platform Toolchains:** Modern GUI frameworks (Qt, GTK) ensure optimal resource utilization without memory bloat. - **Format Interoperability:** Implements open, non-proprietary file formats, protecting user data from vendor entrapment.
Impact on the Open Ecosystem
Safeguards everyday workflow productivity within a trustworthy, zero-telemetry free software ecosystem.
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