Automatic update of the reference pages [skip ci]

Author: GDevelop documentation CI

docs/gdevelop5/extensions/.pages

@@ -113,6 +113,7 @@ nav:
         - Platforms Validation: authorized-platforms-validation
         - Internet Connectivity : internet-connectivity
         - MQTT Client (advanced): mqtt
+        - Multiplayer custom lobbies: multiplayer-custom-lobbies
         - Webpage URL tools (Web browser): urltools
         - WebSocket client: web-socket-client
     - Third-party:
@@ -231,6 +232,7 @@ nav:
             - Dialog Box: dialog-box
             - Flexbox: flex-box
             - Pause when losing focus: pause-focus-lost
+            - Scrollbar: scrollbar
             - Star Rating: star-rating
         - Visual effect:
             - Animation system: animation-system

docs/gdevelop5/extensions/index.md

@@ -162,6 +162,7 @@ Here are listed all the extensions available in GDevelop. The list is divided in
 |<img src="https://asset-resources.gdevelop.io/public-resources/Icons/0d42bc9711bc135b0dfb0084a37469540468e243a560339b99e399bd77f48010_check-decagram.svg" class="extension-icon"></img>|**Platforms Validation**|Checks if the game is currently executed on an allowed platform (for web).|[Read more...](https://oxey405.com/projects/execution-context/index.html) ([reference](/gdevelop5/extensions/authorized-platforms-validation))|
 |<img src="https://resources.gdevelop-app.com/assets/Icons/access-point-network.svg" class="extension-icon"></img>|**Internet Connectivity **|Checks if the device running the game is connected to the internet.|[Read more...](/gdevelop5/extensions/internet-connectivity)|
 |<img src="https://resources.gdevelop-app.com/assets/Icons/message-flash.svg" class="extension-icon"></img>|**MQTT Client (advanced)**|An MQTT client for GDevelop: allow connections to a MQTT server and send/receive messages.|[Read more...](/gdevelop5/extensions/mqtt)|
+|<img src="https://asset-resources.gdevelop.io/public-resources/Icons/Glyphster Pack/Master/SVG/Applications and Programming/a99813f48b4c6bc26cf2a28cb711a75105386ad69408d7e895ff69bb29051e95_Applications and Programming_application_coding_web_page_add.svg" class="extension-icon"></img>|**Multiplayer custom lobbies**|Custom lobbies for built-in multiplayer.|[Read more...](/gdevelop5/extensions/multiplayer-custom-lobbies)|
 |<img src="https://resources.gdevelop-app.com/assets/Icons/web.svg" class="extension-icon"></img>|**Webpage URL tools (Web browser)**|Allows to read URL where a web-game is hosted and manipulate URL strings.|[Read more...](/gdevelop5/extensions/urltools)|
 |<img src="https://resources.gdevelop-app.com/assets/Icons/Line Hero Pack/Master/SVG/Communication/Communication_pc_server_sync_sharing.svg" class="extension-icon"></img>|**WebSocket client**|A WebSocket client for fast client-server networking.|[Read more...](/gdevelop5/extensions/web-socket-client)|
 
@@ -348,6 +349,7 @@ They enhance the user experience of your game and complete the integration with
 |<img src="https://resources.gdevelop-app.com/assets/Icons/Line Hero Pack/Master/SVG/UI Essentials/UI Essentials_chat_message_sms.svg" class="extension-icon"></img>|**Dialog Box**|Dialog Boxes that can be used for RPGs, visual novels, and more.|[Read more...](/gdevelop5/extensions/dialog-box)|
 |<img src="https://resources.gdevelop-app.com/assets/Icons/page-layout-body.svg" class="extension-icon"></img>|**Flexbox**|Allows using flexbox for positioning objects.|[Read more...](/gdevelop5/extensions/flex-box)|
 |<img src="https://resources.gdevelop-app.com/assets/Icons/play-pause.svg" class="extension-icon"></img>|**Pause when losing focus**|Pauses when focus is lost, restarts when focus is regained.|[Read more...](/gdevelop5/extensions/pause-focus-lost)|
+|<img src="https://asset-resources.gdevelop.io/public-resources/Icons/Line Hero Pack/Master/SVG/Interface Elements/c1313ac0735bd1c08d7327fd9a56b4d8cebf1b343f9ba82f1b141358433e1cdb_Interface Elements_interface_ui_scroll_bar_scrollbar.svg" class="extension-icon"></img>|**Scrollbar**|A scrollbar to help making a scroll view.|[Read more...](/gdevelop5/extensions/scrollbar)|
 |<img src="https://resources.gdevelop-app.com/assets/Icons/Glyphster Pack/Master/SVG/UI Essentials/UI Essentials_star.svg" class="extension-icon"></img>|**Star Rating**|A rating system indicated by stars using the shape painter.|[Read more...](/gdevelop5/extensions/star-rating)|
 
 ### Visual effect

docs/gdevelop5/extensions/multiplayer-custom-lobbies/index.md

@@ -0,0 +1,34 @@
+# Multiplayer custom lobbies
+
+<img src="https://asset-resources.gdevelop.io/public-resources/Icons/Glyphster Pack/Master/SVG/Applications and Programming/a99813f48b4c6bc26cf2a28cb711a75105386ad69408d7e895ff69bb29051e95_Applications and Programming_application_coding_web_page_add.svg" class="extension-icon"></img>
+Custom lobbies for built-in multiplayer.
+
+**Authors and contributors** to this community extension: [Jurfix](https://gd.games/Jurfix).
+
+---
+
+Customize the interface of multiplayer lobbies.
+
+Joining will only work if the "join after game starts" setting is enabled, as the game automatically starts after joining a lobby.
+
+!!! tip
+    Learn [how to install new extensions](/gdevelop5/extensions/search) by following a step-by-step guide.
+
+
+
+## Multiplayer custom lobbies 
+
+Customize the interface of multiplayer lobbies.
+
+Joining will only work if the "join after game starts" setting is enabled, as the game automatically starts after joining a lobby. 
+
+### Object expressions
+
+| Expression | Description |  |
+|-----|-----|-----|
+| `Object.LastError()` | Return last error. ||
+
+
+---
+
+*This page is an auto-generated reference page about the **Multiplayer custom lobbies** extension, made by the community of [GDevelop, the open-source, cross-platform game engine designed for everyone](https://gdevelop.io/).* Learn more about [all GDevelop community-made extensions here](/gdevelop5/extensions).

docs/gdevelop5/extensions/scrollbar/index.md

@@ -0,0 +1,60 @@
+# Scrollbar
+
+<img src="https://asset-resources.gdevelop.io/public-resources/Icons/Line Hero Pack/Master/SVG/Interface Elements/c1313ac0735bd1c08d7327fd9a56b4d8cebf1b343f9ba82f1b141358433e1cdb_Interface Elements_interface_ui_scroll_bar_scrollbar.svg" class="extension-icon"></img>
+A scrollbar to help making a scroll view.
+
+**Authors and contributors** to this community extension: [D8H](https://gd.games/D8H), [Jurfix](https://gd.games/Jurfix), [Alios](https://gd.games/Alios).
+
+!!! warning
+    This is an extension made by a community member — but not reviewed
+    by the GDevelop extension team. As such, we can't guarantee it
+    meets all the quality standards of official extensions. In case of
+    doubt, contact the author to know more about what the extension
+    does or inspect its content before using it.
+
+---
+
+A scrollbar to help making a scroll view.
+
+!!! tip
+    Learn [how to install new extensions](/gdevelop5/extensions/search) by following a step-by-step guide.
+
+
+
+## Scrollbar 
+
+A scrollbar to help making a scroll view. 
+
+### Object actions
+
+**Content length**  
+Change the content length of the object. The length of the content to scroll. The scroll bar don't actually scroll the content. You have to do it yourself with camera actions.
+
+**Scroll position**  
+Change the scroll position.
+
+### Object conditions
+
+**Content length**  
+Compare the content length of the object. The length of the content to scroll. The scroll bar don't actually scroll the content. You have to do it yourself with camera actions.
+
+**Scrolling is required**  
+Check if the content is big enough to require scrolling.
+
+**Thumb is dragged**  
+Check if the thumb of the scrollbar is dragged.
+
+**Scroll position**  
+Compare the scroll position.
+
+### Object expressions
+
+| Expression | Description |  |
+|-----|-----|-----|
+| `Object.ContentLength()` | Return the content length of the object. The length of the content to scroll. The scroll bar don't actually scroll the content. You have to do it yourself with camera actions. ||
+| `Object.ScrollPosition()` | Return the scroll position. ||
+
+
+---
+
+*This page is an auto-generated reference page about the **Scrollbar** extension, made by the community of [GDevelop, the open-source, cross-platform game engine designed for everyone](https://gdevelop.io/).* Learn more about [all GDevelop community-made extensions here](/gdevelop5/extensions).