fix: repair Qt6 build of the svg icon cache pool

[mhduiy]

The Dtk6 packaging build (-DDTK5=OFF, Qt 6.8) fails to compile
iconengineplugins/svgiconengine/qsvgiconengine.cpp, so dde-qt6integration
cannot be built. Introduced by #327.

qfuture_impl.h:179:43: error: 'operator()' is not a member of 'std::decay<IconCachePool*>::type'
qtconcurrentstoredfunctioncall.h:189:64: error: no type named 'IsPromise' in 'struct QtPrivate::ArgResolver<IconCachePool*>'

IconCachePool derives from QThreadPool, so QtConcurrent::run(pool, function)
now passes an IconCachePool*. In Qt 6 the argument resolves as follows:

candidate	conversion for IconCachePool*
run(QThreadPool *pool, Function &&, Args &&...)	derived-to-base pointer conversion
run(Function &&, Args &&...) (global pool)	identity, i.e. exact match

Conversion rank is compared before template partial ordering, so the global-pool
overload wins, Function is deduced as IconCachePool*, and the error surfaces
inside QtPrivate::ArgResolver. Previously the call passed
QThreadPool::globalInstance() directly, which is an exact QThreadPool* match
for both candidates; partial ordering then picked the thread-pool overload.

Qt 5 is not affected: its functor overloads are SFINAE-guarded on their return
type (qtconcurrentrun.h:111), so the bogus run(Functor, const Arg1 &) candidate
is discarded and only the run(QThreadPool *, Functor) overload remains.

Fix: pass the pool as an explicit QThreadPool *, which restores the Qt 6 overload
that was selected before #327. Behavior is unchanged: the cache write still runs on
IconCachePool.

Validation:

• cmake --build build6 --target dsvgicon and cmake --build build5 --target dsvgicon (Qt 6.8 / Qt 5.15) both link
• dpkg-buildpackage -b -uc -us -j12: dh_auto_build completes for both build5 and build6
• Runtime smoke test loading each built libdsvgicon.so, rendering a real SVG and reading back the cache PNG (D_ICON_CACHE_PATH): pixmap 64×64 rendered, cache file written on a pooled thread within 50 ms, cached image 64×64

Summary by Sourcery

Fix SVG icon cache pool scheduling so the Qt 6 integration builds successfully without changing cache behavior.

Bug Fixes:

• Restore Qt 6 SVG icon cache pool builds by ensuring cache writes use the intended QThreadPool overload.

Build:

• Fix compatibility with Qt 6 while preserving Qt 5 SVG icon engine builds.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Fixes the Qt 6 SVG icon cache build by forcing QtConcurrent::run to select its QThreadPool overload instead of treating IconCachePool* as a callable; runtime behavior remains unchanged, with cache writes still performed on IconCachePool. Validation covers Qt 5 and Qt 6 builds, packaging, and cache-rendering smoke tests.

Sequence diagram for SVG icon cache write dispatch

sequenceDiagram
    participant IconEngine
    participant IconCachePool
    participant QtConcurrent
    participant QThreadPool
    participant Cache

    IconEngine->>IconCachePool: run(function)
    IconCachePool->>QtConcurrent: run(static_cast<QThreadPool *>(pool), std::move(function))
    QtConcurrent->>QThreadPool: enqueue function
    QThreadPool->>Cache: write cache PNG

Loading

File-Level Changes

Change	Details	Files
Disambiguate the QtConcurrent overload so cache writes continue to execute on the dedicated icon cache thread pool under Qt 6.	Explicitly cast the derived pool instance to QThreadPool* before calling QtConcurrent::run. Move the function object into the selected pool-aware overload. Retain an empty future when the cache pool instance is unavailable.	iconengineplugins/svgiconengine/qsvgiconengine.cpp

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deepin pr auto review

🤖 AI 代码审查报告

总体评分： 100 分 (通过阈值: 70分)

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📊 总体评价

项目	结果
审查结论	代码审查通过
评分详情	未发现安全漏洞和代码质量问题。本次提交修复了 Qt6 下 QtConcurrent::run 的重载解析问题，修改正确、简洁，符合提交目的。

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, mhduiy

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