Release notes for 677

Updates the type signature of the getmetatable() builtin to use the getmetatable() type function.

Adds two new APIs, SocialService:GetEventRsvpStatusAsync() and SocialService:PromptRsvpToEventAsync(), which allow experience events to be subscribed to in-experience.

On the Studio start page, the "@" symbol is no longer present in group names.

Adds MaterialVariant.ColorMapContent, MaterialVariant.MetalnessMapContent, MaterialVariant.NormalMapContent, and MaterialVariant.RoughnessMapContent properties.

Adds a SkyboxOrientation property to Sky.

When a gamepad is used, the X button will now trigger the closest dialog that is visible on screen, rather than just the closest one.

In the New Luau type solver, fixed some instances of un-reducible cyclic type functions when using compound assignment, for example += or -=.

In the New Luau Type Solver, resolve some instances of generic types "leaking" into lambdas, creating unusable callbacks.

Fixes a bug in the audio engine where playing thousands of AudioPlayers at once would not properly prioritize rendering the loudest ones.

Next Gen Explorer beta: Fixes performance drops when new search results would come in.

Next Gen Explorer beta: Box select can now be started from the blank space below the last instance in the hierarchy.

Next Gen Explorer beta: Fixes bug where scrolling to selected instances would sometimes not occur after clearing a search.

Next Gen Explorer beta: Fixes hangs related to instances being created/modified in bulk.

Next Gen Explorer beta: Fixes cases of errors throwing while searching if the instances are moved.

On the Studio start page, in the experiences view, sort dropdown text that exceeds bounds is now truncated, namely "Date Created (Descending)." Also changes group dropdown truncate method to match.

Fixes collaborator icons on the start page: previously the page showed info tiles with 3 collaborators as two avatars with an additional icon and "+1" text; now, the "+1" icon shows the third collaborator avatar. Also replaces the third collaborator with "+{N-2}" for a collaborative session with more than 3 collaborators where "N" represents the total number of collaborators.

In the Next Gen Studio Preview beta feature, restores support for the Shift2 and AltR shortcuts to focus the Move increment spinbox and the Rotate increment spinbox, respectively.

Fixes Studio Settings not saving for users with non-ASCII characters in OS usernames.

In Luau's New Type Solver, fixes a number of bugs where Roblox API types would get refined to never both inside and after conditionals.

Fixes an issue where Sound.TimePosition and AudioPlayer.TimePosition advance while Sound.PlaybackSpeed or AudioPlayer.PlaybackSpeed is set to 0.

In Luau's New Type Solver, improves the error reporting for string.format() calls with non-literal format strings.

Fixes the context menu sometimes opening in the 3D viewport while adjusting camera speed.

Next Gen Explorer beta: Fixes bug where hover effects wouldn't work on an undocked Explorer.

Fixes the Studio camera panning and tilting shortcuts to snap to 45-degree and 10-degree increments, respectively.