change summary:
- switched the SCSViews array type to be a TSharedRef<FSCSDiff> in SMergeTreeView; previously the FSCSDiff instance was passed to TArray::Push() as a temporary, which i think didn't increment the refcount of FSCSDiff's internal widget ptrs on the shallow copy to the new element.
[CL 2454047 by Phillip Kavan in Main branch]
UE-9699 - Fixing all the places we were setting the asset size to 0 explictly, the new default reasonable size is .1, all asset pickers now just use the default, unless they're the content browser.
#lockdown Matt.Kuhlenschmidt
[CL 2449865 by Matthew Griffin in Main branch]
API break: added new pure virtual ISourceControlProvider::UsesChangelists()
API break: added new pure virtual ISourceControlState::FindHistoryRevision(const FString&)
API break: added new pure virtual ISourceControlRevision::GetRevision()
Implementing a Git provider requires us to be able to display revisions that are not indices as Git revisions are hashes. This updates the relvant code to allow us to display these revisions correctly.
[CL 2411986 by Thomas Sarkanen in Main branch]
* Multicast delegate Add* calls now return FDelegateHandles, and Remove* calls are now all deprecated, except for a new Remove function which takes a FDelegateHandle.
* New FConsoleManager::RegisterConsoleVariableSink_Handle and UnregisterConsoleVariableSink_Handle functions which work in terms of FConsoleVariableSinkHandle.
* Timer calls which don't take FTimerHandles are deprecated.
* FTicker::AddTicker now returns an FDelegateHandle and is removed by an overloaded Remove function.
* DEFINE_ONLINE_DELEGATE* macros now define _Handle variants of the Add/Remove functions which return/take handles.
* Various other handle-based registration changes.
* Some unity build fixes.
* Some simplification of delegate code.
* Fixes for lots of existing code to use handle-based registration and unregistration.
#codereview robert.manuszewski
[CL 2400883 by Steve Robb in Main branch]
UETOOL-213 - Minimize Slate FString -> FText conversion (remove SLATE_TEXT_ATTRIBUTE)
This fixes any editor/engine specific code that was passing text to Slate as FString rather than FText.
[CL 2399803 by Jamie Dale in Main branch]
