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<div class="moz-cite-prefix">I still have the crash with the patch
(Qt::WA_NativeWindow) on my machine (Qt 4.8.1).<br>
<br>
Regards,<br>
Marco<br>
<br>
Am 27.07.2012 15:10, schrieb Matthias Kuhn:<br>
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<pre wrap="">Hi Marco,
thank you for verifying and advises on how to reproduce. I missed the
part with "without releasing the mouse"
I have created a patch that resolves the issue here. Can you please
check the patch and commit it if it works for you as well.
Thank you,
Matthias
On Fri, 2012-07-27 at 13:28 +0200, Marco Hugentobler wrote:
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<pre wrap="">Hi Matthias
I still have the resize crash with Qt 4.8.1. To reproduce, load a layer
with many objects. Go with the mouse to the right corner and resize
several times without releasing the mouse. After the mouse release, the
crash occures.
Note: this problem (and the flicker with the workaround) is X11 only.
But still, Linux is the most important platform.
Btw, the threading branch would be the clean solution for the issue. But
if you have another workaround in the short-term, let me know.
Regards,
Marco
Am 27.07.2012 13:08, schrieb Matthias Kuhn:
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<pre wrap="">Hi all,
there is this issue report #4011 "Map canvas flickers when content is
dragged" which is actually pretty annoying and doesn't get much
attention. ( <a class="moz-txt-link-freetext" href="http://hub.qgis.org/issues/4011">http://hub.qgis.org/issues/4011</a> ) I think the solution
would be pretty simple. Please read on.
It was introduced by f4d26d6211830a866030a333236dcfbf15e077aa "Fix for
resize crash, ticket #2714".
This bugfix disables backbuffering, what fixes the crash but leads to
the beforementioned flickering.
The crash seems to be related to Qt versions (probably 4.6 and 4.7
affected). When I tried to reproduce the crash in 4.8.1 (by reverting
abovementioned patch) I couldn't reproduce the crash. So it is well
possible that this problem has been fixed in Qt upstreams.
But: I myself never could reproduce this crash (due to the lack of a
system with old Qt libs). So, I would be happy if someone familiar with
this problem could confirm that this is fixed with Qt 4.8.
Then there are two possibilities (unless you come up with a third one):
1. Check for qVersion upon every repaint as suggested by Martin Dobias
and then enable/disable the workaround accordingly.
2. Switch the workaround on/off by a pre-compiler constant. This way,
any new distro with Qt>=4.8 could be shipped without the workaround-code
being compiled into the binaries.
Any comments on this issue are very welcome, as it makes QGIS look a lot
sweeter :)
Regards
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<pre class="moz-signature" cols="72">--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
<a class="moz-txt-link-abbreviated" href="mailto:marco.hugentobler@sourcepole.ch">marco.hugentobler@sourcepole.ch</a> <a class="moz-txt-link-freetext" href="http://www.sourcepole.ch">http://www.sourcepole.ch</a>
Technical Advisor QGIS Project Steering Committee</pre>
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