io: Remove version checks for versions below Win 10

It's not supported.

Change-Id: Ia17fc7e1d5ae785eca0a6ba530f9b9bc960605d4
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/qfilesystemengine_win.cpp

@@ -694,8 +694,7 @@ QByteArray QFileSystemEngine::id(const QFileSystemEntry &entry)
 //static
 QByteArray QFileSystemEngine::id(HANDLE fHandle)
 {
-    return QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows8 ?
+    return fileIdWin8(HANDLE(fHandle));
-                fileIdWin8(HANDLE(fHandle)) : fileId(HANDLE(fHandle));
 }
 
 //static
@@ -1420,12 +1419,6 @@ bool QFileSystemEngine::moveFileToTrash(const QFileSystemEntry &source,
     // we need the "display name" of the file, so can't use nativeAbsoluteFilePath
     const QString sourcePath = QDir::toNativeSeparators(absoluteName(source).filePath());
 
-    /*
-        Windows 7 insists on showing confirmation dialogs and ignores the respective
-        flags set on IFileOperation. Fall back to SHFileOperation, even if it doesn't
-        give us the new location of the file.
-    */
-    if (QOperatingSystemVersion::current() > QOperatingSystemVersion::Windows7) {
 #  if defined(__IFileOperation_INTERFACE_DEFINED__)
     CoInitialize(NULL);
     IFileOperation *pfo = nullptr;
@@ -1464,35 +1457,6 @@ bool QFileSystemEngine::moveFileToTrash(const QFileSystemEntry &source,
     newLocation = QFileSystemEntry(sink->targetPath);
 
 #  endif // no IFileOperation in SDK (mingw, likely) - fall back to SHFileOperation
-    } else {
-        // double null termination needed, so can't use QString::utf16
-        QVarLengthArray<wchar_t, MAX_PATH + 1> winFile(sourcePath.length() + 2);
-        sourcePath.toWCharArray(winFile.data());
-        winFile[sourcePath.length()] = wchar_t{};
-        winFile[sourcePath.length() + 1] = wchar_t{};
-
-        SHFILEOPSTRUCTW operation;
-        operation.hwnd = nullptr;
-        operation.wFunc = FO_DELETE;
-        operation.pFrom = winFile.constData();
-        operation.pTo = nullptr;
-        operation.fFlags = FOF_ALLOWUNDO | FOF_NO_UI;
-        operation.fAnyOperationsAborted = FALSE;
-        operation.hNameMappings = nullptr;
-        operation.lpszProgressTitle = nullptr;
-
-        int result = SHFileOperation(&operation);
-        if (result != 0) {
-            error = QSystemError(result, QSystemError::NativeError);
-            return false;
-        }
-        /*
-            This implementation doesn't let us know where the file ended up, even if
-            we would specify FOF_WANTMAPPINGHANDLE | FOF_RENAMEONCOLLISION, as
-            FOF_RENAMEONCOLLISION has no effect unless files are moved, copied, or renamed.
-        */
-        Q_UNUSED(newLocation);
-    }
     return true;
 
 }

src/corelib/io/qfilesystemiterator_win.cpp

@@ -89,10 +89,8 @@ bool QFileSystemIterator::advance(QFileSystemEntry &fileEntry, QFileSystemMetaDa
         haveData = true;
         int infoLevel = 0 ;         // FindExInfoStandard;
         DWORD dwAdditionalFlags  = 0;
-        if (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows7) {
         dwAdditionalFlags = 2;  // FIND_FIRST_EX_LARGE_FETCH
         infoLevel = 1 ;         // FindExInfoBasic;
-        }
         int searchOps =  0;         // FindExSearchNameMatch
         if (onlyDirs)
             searchOps = 1 ;         // FindExSearchLimitToDirectories

src/corelib/io/qstandardpaths_win.cpp

@@ -100,8 +100,6 @@ static bool isProcessLowIntegrity() {
     // Disable function until Qt CI is updated
     return false;
 #else
-    if (QOperatingSystemVersion::current() < QOperatingSystemVersion::Windows8)
-        return false;
     // non-leaking pseudo-handle. Expanded inline function GetCurrentProcessToken()
     // (was made an inline function in Windows 8).
     const auto process_token = HANDLE(quintptr(-4));