Hi,
The behaviour of QUrl::toLocalFile() was changed between Qt 4.7.4 and 4.8. I
would like to open discussion for reverting that change for 4.8 in order to
maintain backward compatibility for applications.
The change concerns how toLocalFile() handles relative urls. Before 4.8 it
returned the path, but in 4.8 it returns an empty string.
4.7: QUrl("dir/file.html").toLocalFile(); returns "dir/file.html"
4.8: QUrl("dir/file.html").toLocalFile(); returns QString()
This change has been previously discussed in QTBUG-19827, and the conclusion
was that this is an intentional break of binary and source compatibility.
The documentation doesn't specify how relative urls are handled by the
function. I can see how both behaviours make some sense. A relative url can
refer to a local file, but that can't be deduced from the url alone. 4.7 took a
more lenient approach and returned the relative path. In 4.8 relative urls must
be resolved first, and only when we know for sure that the url refers to a
local file, the path is returned.
The behaviour of 4.7 gives application a bit more flexibility on how to handle
the urls. I can't see a clear benefit from the new behaviour.
This is an unnecessary break of compatibility between minor versions, and this
has been found to break some paid applications in Ovi Store. For that reason I
would like to see the behaviour reverted for 4.8.
BR,
Aapo
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