Add callback for source data generation to asset views.
Add UObject enumeration to content browser API (By Rex Hill).
Intentionally reserve thumbnail pool sizes instead of flat 1024 reservation.
#jira UE-129795
#rb Rex.Hill
#preflight 615e0c51c5e9590001f4a22a
#preflight 615e4400f13022000126efda
#robomerge[BOT4] 5.0
#robomerge[BOT1] Main
[CL 17744889 by daren cheng in ue5-main branch]
Fix widget library locking up when scrolling edge is just before a new asset view.
Review feedback.
#jira UE-121731
#rb Patrick.Boutot
[CL 17352748 by daren cheng in ue5-main branch]
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Expose AssetView from ContentBrowser
Add Library view model, partial reuse from pallete view model (needs more reuse).
Add support for widget asset dragdrop via code classes & to widget hierarchy.
#jira UE-121731
#rb Patrick.Boutot
#preflight 611a7ea8008be900013ad2e6
[CL 17180322 by daren cheng in ue5-main branch]