MSBuild: Track QRC asset dependencies

Cache each resource collection's rcc file list and feed those assets into native tlogs, refreshing the cache only when the QRC file or rcc tool changes.

dep/vsprops/QtCompile.props

@@ -38,12 +38,50 @@
   </ItemDefinitionGroup>
 
   <!--Passes all .qrc files to rcc and puts output in the build directory-->
+  <Target Name="QtResourcePrepare"
+    Condition="'@(QtResource)'!=''">
+    <ItemGroup>
+      <QtResource>
+        <DependencyCache>$(QtToolOutDir)rcc_%(QtResource.Filename).inputs</DependencyCache>
+      </QtResource>
+    </ItemGroup>
+  </Target>
+
+  <Target Name="QtResourceDependencies"
+    DependsOnTargets="QtResourcePrepare"
+    Condition="'@(QtResource)'!=''"
+    Inputs="%(QtResource.FullPath);$(QtHostBinDir)rcc.exe"
+    Outputs="%(QtResource.DependencyCache)">
+    <Error Condition="!$(DSQTDIRValid)" Text="Qt directory non-existent (download/extract the zip)" />
+    <MakeDir Directories="$(QtToolOutDir)" />
+    <!-- Cache rcc's authoritative file list per .qrc; target batching keeps each manifest independent. -->
+    <Exec
+      Command="&quot;$(QtHostBinDir)rcc.exe&quot; --list &quot;%(QtResource.FullPath)&quot;"
+      ConsoleToMSBuild="true"
+      StandardOutputImportance="Low">
+      <Output TaskParameter="ConsoleOutput" ItemName="_QtResourceDependency" />
+    </Exec>
+    <WriteLinesToFile
+      File="%(QtResource.DependencyCache)"
+      Lines="@(_QtResourceDependency)"
+      Overwrite="true" />
+    <ItemGroup>
+      <_QtResourceDependency Remove="@(_QtResourceDependency)" />
+    </ItemGroup>
+  </Target>
+
   <Target Name="QtResource"
     AfterTargets="Build"
-    Condition="'@(QtResource)'!=''">
+    DependsOnTargets="QtResourceDependencies"
+    Condition="'@(QtResource)'!=''"
+    Outputs="%(QtResource.DependencyCache)">
+    <!-- Outputs intentionally forces one target batch per .qrc; with no Inputs, GetOutOfDateItems still decides whether rcc runs. -->
+    <ReadLinesFromFile File="%(QtResource.DependencyCache)">
+      <Output TaskParameter="Lines" ItemName="_QtResourceDependency" />
+    </ReadLinesFromFile>
     <ItemGroup>
       <QtResource>
-        <AdditionalInputs>%(QtResource.FullPath)</AdditionalInputs>
+        <AdditionalInputs>%(QtResource.FullPath);@(_QtResourceDependency)</AdditionalInputs>
         <Command>&quot;$(QtHostBinDir)rcc.exe&quot; -binary -no-compress &quot;%(QtResource.FullPath)&quot; -o &quot;$(QtRccOutDir)%(QtResource.Filename).rcc&quot;</Command>
         <Outputs>$(QtRccOutDir)%(QtResource.Filename).rcc</Outputs>
       </QtResource>
@@ -57,7 +95,7 @@
       DependenciesMetadataName="AdditionalInputs"
       CommandMetadataName="Command"
       TLogDirectory="$(TLogLocation)"
-      TLogNamePrefix="QtResource"
+      TLogNamePrefix="QtResource_%(QtResource.Filename)"
       CheckForInterdependencies="false">
       <Output TaskParameter="OutOfDateSources" ItemName="_QtResourceOutOfDate" />
     </GetOutOfDateItems>
@@ -65,11 +103,13 @@
     <Exec Condition="'@(_QtResourceOutOfDate)'!=''" Command="%(_QtResourceOutOfDate.Command)" />
     <ItemGroup>
       <_QtResourceOutOfDate Remove="@(_QtResourceOutOfDate)" />
+      <_QtResourceDependency Remove="@(_QtResourceDependency)" />
     </ItemGroup>
   </Target>
 
-  <Target Name="QtResourceClean">
+  <Target Name="QtResourceClean" DependsOnTargets="QtResourcePrepare">
     <Delete Files="@(QtResource->'$(QtRccOutDir)%(Filename).rcc')" />
+    <Delete Files="@(QtResource->'%(DependencyCache)')" />
   </Target>
 
   <!--Passes all .ui files to uic and puts output in the build directory-->