[Auto] [Update] Document expression syntax highlighting, layer property type, AI sub-agents, and other recent GDevelop changes

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This PR was automatically generated by the Update docs from GDevelop commits workflow.

An AI coding agent analysed recent commits in 4ian/GDevelop
and updated the documentation to reflect user-facing changes.

GDevelop commits covered

8b00514af Fix path breaking webapp (#8635)
4bf059912 Rework AI request handling to support sub-agents and better analysis/advice/answers from the AI (#8574)
d57a3960e Add extra CI checking an export using the CLI options of GDevelop (#8632)
080bc15f5 Add missing override specifiers to event classes (#8633)
c65f953f4 Add argument for CLI command execution for CI pipelines (#8587)
12867be22 Fix potential crashes (#8625)
3f94e7dd1 Reduce dialog width for extension details, project properties and layer properties (#8628)
e3f3a1ffa Fix editor crashes after modifying custom object extensions (#8626)
749a78650 Persist the preference "Start all previews from scene X" in the project file (#8622)
6dc9ed5d2 Fix minus sign color for negative numbers (#8621)
59e5a7ae8 Only run Travis for master branch and PR to master
f39d8bb08 Add experimental support for "canonical" serialization of events (#8552)
a987d2c4b [Auto PR] Update translations (#8601)
5aed979a0 Fix regression when dragging events on iOS touch devices (#8616)
374a5670c No longer use bold for objects inside expressions (#8618)
39991b7fc Remove a useless message wrongly displayed when updating an extension without any dependencies (#8617)
ae3e4e6ed Fix a regression on "edit or add variable" allowing to add variable with an empty name (#8614)
bd054aa49 Fix operator color in conditions (#8613)
17ace4e36 Display boolean parameters in pink (#8612)
830587f25 Fix object parameter color in expression (#8611)
032b93f0e Fix copied events to keep the same order when pasted (#8610)
cea1410fb Add syntax highlighting for expressions in events (#8538)
391caaddf Add internal hints for objects without known width/height (#8608)
d9d8a7d3e Fix a regression on the displayed position of custom objects (#8604)
c8d5f4600 Add a button in the extension editor to select behaviors with the dialog (#8602)
f9d1d4c60 Fix and show the button to add parameters to "action with operator" functions as disabled (#8603)
d81a6899d Allow to create variables from autocompletion in more cases (#8583)
cacd28eed Add a "layer" property type for custom behaviors (#8596)
e2de84627 Allow to load and unload objects from other scenes (#8592)
584cca2d4 Export classes in ResourceLoader for better TypeScript compatibility (#8594)
0b3f8e720 Improve types for TypeScript 6 (#8591)
4bb652f5e Fix Ai Panel not aligned to the top properly on mobile + improve games search to be more relevant (#8590)
f60562eae [Auto PR] Update translations (#8585)
1c17c895b Allow custom objects to move layer cameras (#8572)
651c93ae1 Add "Select All" in Events Sheet and ability to deselect an event when doing a multi-selection (#8578)
0eb6014a9 Fix some visual glitches in the Events Sheet when opening and scrolling (#8571)

The AI agent summary is:

Made concise updates across seven doc pages to reflect recent user-facing GDevelop changes:

• interface/preview.md: noted that the "Start all previews from scene X" setting now persists in the project file.
• behaviors/events-based-behaviors/index.md: added the new Layer property type for custom behaviors.
• interface/scene-editor/layers-and-cameras.md: mentioned that custom objects' layer cameras can now be moved via the usual camera actions.
• all-features/resources-loading/index.md: noted the new scene name parameter on Preload/Unload object actions and the matching condition.
• interface/events-editor/index.md: documented the new Select All and deselect-on-click multi-selection behavior.
• events/expressions/index.md: added a short note about the new syntax highlighting in expressions.
• interface/ai/agent/index.md: documented sub-agents appearing inline during agent runs.

Skipped: bug fixes, internal/TypeScript/CI commits, the CLI/portable build (developer/CI tooling, outside the game-creator audience).

Please review the changes carefully before merging.

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Project	Deployment	Actions	Updated (UTC)
gdevelop-wiki	Ready	Preview, Comment	May 22, 2026 3:39pm