fix: use update_file() instead of full scan() on single-file writes (prevents EditorFileSystem global-class SIGABRT)

[dsarno]

Problem

script_create, script_patch, and filesystem write_text each triggered a full recursive EditorInterface.get_resource_filesystem().scan() per write. Under concurrent file creation (multiple MCP clients, or a stress run), these scans stack — the editor re-enqueues the update_scripts_classes / update_script_paths_documentation WorkerThreadPool tasks while a previous scan is still pending:

ERROR: Task 'update_scripts_classes' already exists.
ERROR: Task 'update_script_paths_documentation' already exists.
ERROR: Condition "!tasks.has(p_task)" is true.

…leaving the global-class registry inconsistent. The next idle filesystem scan can then SIGABRT in ScriptServer::remove_global_class_by_path() — a hard editor crash:

SIGABRT → abort
  ScriptServer::remove_global_class_by_path(String const&)
  EditorFileSystem::_register_global_class_script(...)
  EditorFileSystem::_update_script_classes()
  EditorFileSystem::_update_scan_actions()
  EditorFileSystem::_notification(int)

Engine-side record of the underlying abort: dsarno/godot#6.

Fix

Switch all three sites to EditorFileSystem.update_file(path) — the single-file registration call the rest of the plugin already uses (material/theme handlers, filesystem reimport, resource_io). It registers just the written file without the recursive scan-action batch, so the duplicate-task race can't occur. It's also cheaper than a full project rescan per write.

Validation (concurrency stress harness)

	full scan() (before)	update_file() (after)
Task ... already exists / !tasks.has(p_task)	5 + 5 per run	0
SIGABRT	intermittent (3 crash reports)	none across heavier runs

• create → immediate attach still settles (import_settled=true) — Harden script_create -> script_attach against Godot import races #261 import-settle behaviour preserved.
• GDScript script (38) + filesystem (16) suites pass; Python import-settle (6) + script/filesystem unit tests (67) pass.

🤖 Generated with Claude Code

[codecov]

Codecov Report

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