[Hot Reload] Do not attempt to apply empty deltas. #63979
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….Extensions.Logging.Abstractions (#178) Updated [Microsoft.AspNetCore.TestHost](https://github.com/dotnet/aspnetcore) from 9.0.9 to 9.0.11. <details> <summary>Release notes</summary> _Sourced from [Microsoft.AspNetCore.TestHost's releases](https://github.com/dotnet/aspnetcore/releases)._ ## 9.0.11 [Release](https://github.com/dotnet/core/releases/tag/v9.0.11) ## What's Changed * Update branding to 9.0.11 by @vseanreesermsft in dotnet/aspnetcore#63950 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#63677 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/aspnetcore#63678 * [release/9.0] (deps): Bump src/submodules/googletest from `eb2d85e` to `9706f75` by @dependabot[bot] in dotnet/aspnetcore#63894 * [release/9.0] Fixed devtools url used for debug with chrome and edge by @github-actions[bot] in dotnet/aspnetcore#61948 * [release/9.0] (http2): Lower WINDOWS_UPDATE received on (half)closed stream to stream abortion by @DeagleGross in dotnet/aspnetcore#63934 * [release/9.0] Re-quarantine ServerRoutingTest.NavigationLock_OverlappingNavigationsCancelExistingNavigations_HistoryNavigation by @github-actions[bot] in dotnet/aspnetcore#63956 * [release/9.0] Fix nginx install on mac, linux by @wtgodbe in dotnet/aspnetcore#63966 * [Hot Reload] Do not attempt to apply empty deltas. by @tmat in dotnet/aspnetcore#63979 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/aspnetcore#64036 * Revert log level severity for unknown proxy in ForwardedHeadersMiddleware by @BrennanConroy in dotnet/aspnetcore#64091 * Set timeoutInMinutes to 0 for Windows build job by @vseanreesermsft in dotnet/aspnetcore#64126 **Full Changelog**: dotnet/aspnetcore@v9.0.10...v9.0.11 ## 9.0.10 [Release](https://github.com/dotnet/core/releases/tag/v9.0.10) ## What's Changed * Update branding to 9.0.10 by @vseanreesermsft in dotnet/aspnetcore#63510 * [9.0] Make duplicate deb/rpm packages so we can sign them with the new PMC key by @jkoritzinsky in dotnet/aspnetcore#63249 * [release/9.0] Extend Unofficial 1ES template in IdentityModel nightly tests job by @github-actions[bot] in dotnet/aspnetcore#63465 * [release/9.0] (deps): Bump src/submodules/googletest from `373af2e` to `eb2d85e` by @dependabot[bot] in dotnet/aspnetcore#63501 * [release/9.0] Quarantine ResponseBody_WriteContentLength_PassedThrough by @wtgodbe in dotnet/aspnetcore#63533 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/aspnetcore#63304 * [release/9.0] [OpenAPI] Use invariant culture for TextWriter by @martincostello in dotnet/aspnetcore#62239 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#63303 * Unquarantine `RadioButtonGetsResetAfterSubmittingEnhancedForm` by @ilonatommy in dotnet/aspnetcore#63556 * [release/9.0] Update dependencies from dotnet/extensions by @dotnet-maestro[bot] in dotnet/aspnetcore#63577 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/aspnetcore#63604 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/aspnetcore#63648 * backport(9.0): Fix runtime architecture detection logic in ANCM. by @DeagleGross in dotnet/aspnetcore#63707 **Full Changelog**: dotnet/aspnetcore@v9.0.9...v9.0.10 Commits viewable in [compare view](dotnet/aspnetcore@v9.0.9...v9.0.11). </details> Updated [Microsoft.Extensions.Logging.Abstractions](https://github.com/dotnet/runtime) from 9.0.9 to 9.0.11. <details> <summary>Release notes</summary> _Sourced from [Microsoft.Extensions.Logging.Abstractions's releases](https://github.com/dotnet/runtime/releases)._ ## 9.0.11 [Release](https://github.com/dotnet/core/releases/tag/v9.0.11) ## What's Changed * [release/9.0-staging] Fix DefaultIfEmptyIterator.TryGetElementAt returning default value for out-of-bounds indices by @github-actions[bot] in dotnet/runtime#119844 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#119981 * [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @github-actions[bot] in dotnet/runtime#119978 * [release/9.0-staging] Add acquire barrier to populate bit reading by @github-actions[bot] in dotnet/runtime#119967 * [release/9.0-staging] Bump System.Text.Json toolset version by @github-actions[bot] in dotnet/runtime#113385 * [release/9.0-staging] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#120034 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#120033 * [release/9.0-staging] Update dependencies from dotnet/source-build-reference-packages by @dotnet-maestro[bot] in dotnet/runtime#120020 * [release/9.0-staging] `UnsafeAccessor` - ambiguous name and signature match by @AaronRobinsonMSFT in dotnet/runtime#120011 * [release/9.0] Bump OSX.12 helix queues to OSX.13 by @steveisok in dotnet/runtime#119814 * [release/9.0-staging] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#120128 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#120129 * [release/9.0-staging] Update dependencies from dotnet/source-build-reference-packages by @dotnet-maestro[bot] in dotnet/runtime#120106 * [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @github-actions[bot] in dotnet/runtime#120057 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#120240 * [release/9.0] [mono] Make the compressed interface bitmap feature usable by @BrzVlad in dotnet/runtime#120154 * [release/9.0-staging] Remove an STJ deep nested object test causing occasional failures by @github-actions[bot] in dotnet/runtime#120265 * [release/9.0-staging] Update dependencies from dotnet/hotreload-utils by @dotnet-maestro[bot] in dotnet/runtime#120331 * [release/9.0-staging] Detect if RSA-384 is supported on the platform by @vcsjones in dotnet/runtime#120382 * [release/9.0-staging] Load Standalone GC correctly in component scenarios. by @github-actions[bot] in dotnet/runtime#120236 * [release/9.0-staging] [mono][hotreload] Make the runtime ignore an update if it is an empty one by @github-actions[bot] in dotnet/runtime#120335 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#120349 * [release/9.0-staging] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#120397 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#120418 * [release/9.0-staging] Update dependencies from dotnet/xharness by @dotnet-maestro[bot] in dotnet/runtime#120425 * [release/9.0-staging] Update dependencies from dotnet/hotreload-utils by @dotnet-maestro[bot] in dotnet/runtime#120404 * [release/9.0-staging] Prevent format injection in hosting Windows PAL printf functions when redirected to file by @jkoritzinsky in dotnet/runtime#119786 * [release/9.0-staging] Update dependencies from dotnet/runtime-assets by @dotnet-maestro[bot] in dotnet/runtime#120417 * Update branding to 9.0.11 by @vseanreesermsft in dotnet/runtime#120474 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#120586 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#120409 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#120396 * [release/9.0-staging] [mono][interp] Fix various leaks, primarily around dynamic methods by @BrzVlad in dotnet/runtime#120600 * [release/9.0-staging] [mono][sgen] Fix incorrect condition when checking if we should do a major collection by @github-actions[bot] in dotnet/runtime#120533 * [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @github-actions[bot] in dotnet/runtime#120570 * [manual] Merge release/9.0-staging into release/9.0 by @PranavSenthilnathan in dotnet/runtime#120615 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/runtime#120719 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#120765 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#120779 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#120814 * [release/9.0] Update Microsoft.Build.* versions to 17.8.43 by @PranavSenthilnathan in dotnet/runtime#120820 **Full Changelog**: dotnet/runtime@v9.0.10...v9.0.11 ## 9.0.10 [Release](https://github.com/dotnet/runtime/releases/tag/v9.0.9) ## What's Changed * [release/9.0-staging] Disable release assert on disallowed thread re-initialization for managed C++ by @github-actions[bot] in dotnet/runtime#118842 * [release/9.0-staging] [wasm][AOT] fix codegen for small structs on stack by @github-actions[bot] in dotnet/runtime#118416 * Update branding to 9.0.10 by @vseanreesermsft in dotnet/runtime#119280 * [release/9.0-staging] Don't use vfork on android by @github-actions[bot] in dotnet/runtime#118331 * [release/9.0-staging] [mono][debugger] Fix assertion when stepping by @github-actions[bot] in dotnet/runtime#118459 * [release/9.0-staging][maccatalyst] Check for -Wno-overriding-option for compatibility with clang in Xcode 16.3+ by @akoeplinger in dotnet/runtime#119301 * [release/9.0-staging][HTTP] Stress fix for docker compose by @ManickaP in dotnet/runtime#119455 * Merging internal commits for release/9.0 by @vseanreesermsft in dotnet/runtime#119505 * [9.0] Preserve Lock ID Members by @jkoritzinsky in dotnet/runtime#119281 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#118940 * [release/9.0-staging] Update dependencies from dotnet/hotreload-utils by @dotnet-maestro[bot] in dotnet/runtime#118151 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#118372 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#118423 * [release/9.0-staging] Update dependencies from dotnet/roslyn by @dotnet-maestro[bot] in dotnet/runtime#118193 * [release/9.0-staging] Update dependencies from dotnet/runtime-assets by @dotnet-maestro[bot] in dotnet/runtime#118758 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#119619 * [release/9.0-staging] Update dependencies from dotnet/source-build-reference-packages by @dotnet-maestro[bot] in dotnet/runtime#119598 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#119620 * [release/9.0-staging] Update dependencies from dotnet/xharness by @dotnet-maestro[bot] in dotnet/runtime#119051 * [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @github-actions[bot] in dotnet/runtime#118492 * [release/9.0-staging] [H/3] Fix interop tests. by @github-actions[bot] in dotnet/runtime#119522 * [release/9.0-staging] Disable tests parallelization in flaky OleDB tests by @github-actions[bot] in dotnet/runtime#119626 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#119690 * [release/9.0-staging] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#118224 * [release/9.0-staging] Update dependencies from dotnet/runtime-assets by @dotnet-maestro[bot] in dotnet/runtime#119677 * [release/9.0-staging] Update dependencies from dotnet/hotreload-utils by @dotnet-maestro[bot] in dotnet/runtime#119635 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#119669 * [release/9.0-staging] Fix recursion issue found in PROCCreateCrashDump by @github-actions[bot] in dotnet/runtime#119128 * [release/9.0-staging] Update dependencies from dotnet/cecil by @dotnet-maestro[bot] in dotnet/runtime#119742 * [automated] Merge branch 'release/9.0' => 'release/9.0-staging' by @github-actions[bot] in dotnet/runtime#119721 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#119753 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#119793 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#119809 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#119832 * [release/9.0-staging] Update dependencies from dotnet/roslyn by @dotnet-maestro[bot] in dotnet/runtime#119830 * Backport macOS 26 Tahoe test fixes to release/9.0-staging by @vcsjones in dotnet/runtime#119716 * [release/9.0-staging] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#119871 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#119872 * [release/9.0-staging] Disable Multicast SocketOption test by @github-actions[bot] in dotnet/runtime#119889 * [release/9.0-staging] Update dependencies from dotnet/icu by @dotnet-maestro[bot] in dotnet/runtime#119932 * [release/9.0] Update dependencies from dotnet/emsdk by @dotnet-maestro[bot] in dotnet/runtime#119900 * [manual] Merge release/9.0-staging into release/9.0 by @tarekgh in dotnet/runtime#119966 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#120025 * [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in dotnet/runtime#120111 **Full Changelog**: dotnet/runtime@v9.0.9...v9.0.10 Commits viewable in [compare view](dotnet/runtime@v9.0.9...v9.0.11). </details> Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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Do not call the runtime to apply empty deltas. The change applies the same condition we use in 10.0 to 9.0.
Description
The 9.0 runtime does not ignore empty deltas -- the change to ignore them was only implemented in .NET 10: dotnet/runtime#120333.
When debugging WASM app with the new WASM ICoreDebug-based debugger, the debugger applies deltas and the agent is sent empty deltas. The expectation is that the deltas are ignored and the only action that the agent performs is invoking metadata update handlers.
If the deltas are not skipped in this scenario the 9.0 runtime throws an exception:
"Applying deltas through the debugger and System.Reflection.Metadata.MetadataUpdater.ApplyUpdate simultaneously is not supported"
If we didn't call the agent at all the deltas would be correctly applied by the new WASM debugger but the metadata update handlers wouldn't be executed and thus the app wouldn't function properly (caches not invalidated, UI not refreshed).
Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2571149
Customer Impact
Hot Reload is broken for customers debugging WASM projects from Visual Studio 2026 using the new ICorDebug-based WASM debugger and projects targeting net9.0.
Regression?
Partial regression: Previous versions of VS did not fail to apply change entirely, but also did not invoke update handlers, which leaves the app in partially-updated state.
Fixing that in VS caused regression in net90 projects because they lack the condition added in this change.
Risk
The condition is trivial and well tested in net10.
Verification
Packaging changes reviewed?
When servicing release/2.3