[PyQt] QTextBlockUserData forgotten in SIP 4.14.3, bug?

Phil Thompson phil at riverbankcomputing.com
Tue Mar 12 09:07:18 GMT 2013

On Tue, 12 Mar 2013 09:20:48 +0100, Wilbert Berendsen <wbsoft at xs4all.nl>
> Op Mon, 11 Mar 2013 14:01:21 +0000
> Phil Thompson <phil at riverbankcomputing.com> schreef:
>> On Mon, 11 Mar 2013 11:13:15 +0100, Wilbert Berendsen
>> <wbsoft at xs4all.nl> wrote:
>> > Hi,
>> > 
>> > It seems sip 4.14.3 forgets QTextUserData objects.
>> > (...)
>> > Note that it isn't forgotten that there is a QTextUserData set, but
>> > it is returned as a different object, without the 'value' attribute
>> > that was previously set.
>> > 
>> > Is this a bug?
>> It's a PyQt bug - fixed in tonight's snapshot.
> I tried to work around the bug, but that seems not to be possible. Even
> when deriving from QTextBlockUserData, the python wrapper is lost when
> requesting the same object later. Sometime it lives for a few seconds
> but eventually it dies, forgetting the Python attributes that were set.
> I see, besides Frescobaldi[1], also Ninja[2] suffering from this
> problem.
> [1] https://github.com/wbsoft/frescobaldi
> [2] https://github.com/ninja-ide/ninja-ide
> In the case of Frescobaldi, the bug is quite severe: Frescobaldi
> tokenizes all entered text, caching the tokens (created by a
> QSyntaxHighlighter) in the QTextBlockUserData for every line of text.
> Due to this bug the parser runs every time on the whole document, as
> the parsing state is also lost, causing slowdowns of minutes...
> The QTextBlockUserData is the only place where custom information can
> be attached to text lines. I don't know of any other way to store
> information relating to text blocks.
> Could the fix for this bug also be forwarded to Linux packagers soon, as
> many new Linux distros now package recent PyQt4 versions?
> If I can help, I'd be grateful.
> best wishes,
> Wilbert

I'll make a new release sooner rather than later. I do invite people to
test current snapshots before making a release but I suspect people rarely


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