emacs-async

To preserve cursor position in Emacs Lisp asynchronous callbacks, use markers to track positions and explicitly pass context into the callback instead of relying on the current cursor state. This ensures positions survive buffer edits during async operations.

Elisp process filters move the cursor unexpectedly because buffer modifications during asynchronous execution invalidate raw position integers. Using marker-based position tracking and explicit context passing mitigates these cursor-position bugs across async callbacks.

The best way to handle buffer context in Elisp timers is to use lexical binding to capture variables and validate the buffer before repositioning point. This maintains correct context for safe asynchronous execution across timer-triggered functions.

To validate point before calling cursor-dependent functions like org-entry-get, validate and reposition the point using markers before executing the operation. This ensures the cursor is in the correct buffer context during asynchronous code execution.

Yes, you can use lexical binding to capture variables for async Elisp execution. This approach safely captures the needed context, preventing reliance on mutable global cursor states during asynchronous callbacks, timers, and process filters.

You need marker-based position tracking in Emacs Lisp when performing asynchronous operations that modify the buffer. Markers automatically update their positions to survive edits during async callbacks, timers, and process filters, preventing cursor-position bugs.