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qelectrotech-source-mirror/sources
Shane Ringrose f2d297b0d8 Fix thread-unsafe QStandardPaths calls in dataDir/configDir
QStandardPaths::writableLocation() is not thread-safe in Qt5.
ElementsCollectionModel::reload() launches:

  QtConcurrent::map(m_items_list_to_setUp, setUpData)

Each worker calls FileElementCollectionItem::setUpData()
→ collectionPath() → isCollectionRoot()
→ QETApp::userMacrosDir() → QETApp::dataDir()
→ QStandardPaths::writableLocation()  ← SIGSEGV (null deref)

The crash was confirmed by Valgrind (address 0x0, inside
libQt5Core's writableLocation internals).

Fix: replace the bare QStandardPaths calls in dataDir() and
configDir() with a C++11 static-local lambda.  The compiler
guarantees the lambda body runs exactly once across all threads
(magic statics, ISO C++11 §6.7).  After the first (main-thread)
call the result is returned lock-free.

Relates-to: #492 (same QtConcurrent lifetime pattern fixed in
QETProject::writeBackup by PR #512).
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