#lockdown Nick.Penwarden
#rb none
==========================
MAJOR FEATURES + CHANGES
==========================
Change 3209340 on 2016/11/23 by Ben.Marsh
Convert UE4 codebase to an "include what you use" model - where every header just includes the dependencies it needs, rather than every source file including large monolithic headers like Engine.h and UnrealEd.h.
Measured full rebuild times around 2x faster using XGE on Windows, and improvements of 25% or more for incremental builds and full rebuilds on most other platforms.
* Every header now includes everything it needs to compile.
* There's a CoreMinimal.h header that gets you a set of ubiquitous types from Core (eg. FString, FName, TArray, FVector, etc...). Most headers now include this first.
* There's a CoreTypes.h header that sets up primitive UE4 types and build macros (int32, PLATFORM_WIN64, etc...). All headers in Core include this first, as does CoreMinimal.h.
* Every .cpp file includes its matching .h file first.
* This helps validate that each header is including everything it needs to compile.
* No engine code includes a monolithic header such as Engine.h or UnrealEd.h any more.
* You will get a warning if you try to include one of these from the engine. They still exist for compatibility with game projects and do not produce warnings when included there.
* There have only been minor changes to our internal games down to accommodate these changes. The intent is for this to be as seamless as possible.
* No engine code explicitly includes a precompiled header any more.
* We still use PCHs, but they're force-included on the compiler command line by UnrealBuildTool instead. This lets us tune what they contain without breaking any existing include dependencies.
* PCHs are generated by a tool to get a statistical amount of coverage for the source files using it, and I've seeded the new shared PCHs to contain any header included by > 15% of source files.
Tool used to generate this transform is at Engine\Source\Programs\IncludeTool.
[CL 3209342 by Ben Marsh in Main branch]
UE-17782 - Editor must be restarted for New Collections to appear after syncing
These use FFileCache to avoid detecting changes that are made by the collection manager itself.
This also fixes some issues when merging collection sets together, and fixes some places where UI wouldn't update when a collection was changed due to an update or merge.
[CL 2612319 by Jamie Dale in Main branch]
UETOOL-332 - Collections 2.0
This avoids the need to repeat the module name throughout the code (and potentially performing an FName look up each time).
[CL 2572436 by Jamie Dale in Main branch]
UETOOL-332 - Collections 2.0
UETOOL-370 - Ability to assign many collections to a single asset very quickly
The collections view now provides check boxes next to each collection. These can be used to quickly add or remove a large selection of assets to or from a collection.
This feature is also available in the Content Browser via the asset context menu. The "Collections" section now contains a sub-menu which lists the available collections, and allows you to quickly add or remove the current selection to or from a collection.
[CL 2570749 by Jamie Dale in Main branch]
