Fix #17579 - Use guid to make temp file name for zip file

QTemporaryFile doesn't work here with QgsZipUtils on Windows for some
reason but is fine on Linux.  Yay development!

src/core/qgsarchive.cpp

@@ -22,6 +22,9 @@
 #include "qgsauxiliarystorage.h"
 #include <iostream>
 
+#include <QStandardPaths>
+#include <QUuid>
+
 QgsArchive::QgsArchive()
   : mDir( new QTemporaryDir() )
 {
@@ -54,10 +57,9 @@ void QgsArchive::clear()
 
 bool QgsArchive::zip( const QString &filename )
 {
-  // create a temporary path
-  QTemporaryFile tmpFile;
-  tmpFile.open();
-  tmpFile.close();
+  QString tempPath = QStandardPaths::standardLocations( QStandardPaths::TempLocation ).at( 0 );
+  QString uuid = QUuid::createUuid().toString();
+  QFile tmpFile( tempPath + QDir::separator() + uuid );
 
   // zip content
   if ( ! QgsZipUtils::zip( tmpFile.fileName(), mFiles ) )
@@ -79,9 +81,6 @@ bool QgsArchive::zip( const QString &filename )
     return false;
   }
 
-  // keep the zip filename
-  tmpFile.setAutoRemove( false );
-
   return true;
 }