QTemporaryFile(Name): don't make the path absolute on generation

I need to use QTemporaryFileName in a context where absolute paths are
not allowed because they change the behavior of the system call (the
-at() POSIX system calls); see next commit. This required a fix to a
seemingly unrelated test, which depended on the absolute path, because
QPluginLoader and QLibrary assume a file name with no path components
imply "search the standard places".

[ChangeLog][Important Behavior Changes][QTemporaryFile] This class will
now return relative file paths in fileName() if the file template was
also a relative path (it used to always return an absolute path). The
temporary files are still created in the same directory; this change
only affects the length of the path the function returns.

Change-Id: I79e700614d034281bf55fffd178f65f2b3d602d8
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 2 insertions, 3 deletions

diff --git a/src/corelib/io/qtemporaryfile.cpp b/src/corelib/io/qtemporaryfile.cpp
index a98256c1f4..ff6a514fc9 100644
--- a/src/corelib/io/qtemporaryfile.cpp
+++ b/src/corelib/io/qtemporaryfile.cpp
@@ -70,9 +70,8 @@ QTemporaryFileName::QTemporaryFileName(const QString &templateName)
         qfilename.append(".XXXXXX"_L1);
 
     // "Nativify" :-)
-    QFileSystemEntry::NativePath filename = QFileSystemEngine::absoluteName(
-            QFileSystemEntry(qfilename, QFileSystemEntry::FromInternalPath()))
-        .nativeFilePath();
+    QFileSystemEntry::NativePath filename =
+            QFileSystemEntry(QDir::cleanPath(qfilename)).nativeFilePath();
 
     // Find mask in native path
     phPos = filename.size();