composer: qgis freezes when pasting a map legend item

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)
Original Redmine Issue: 14005
Affected QGIS version: master
Redmine category:map_composer/printing

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Since 2.12, pasting a map legend item onto a new composer window freezes QGIS, and the only way to get it unfreezed is to kill it. The gdb trace is as follow:

#_0  0x00007ffff63999c9 in QHash<QString, QgsExpressionContextScope::StaticVariable>::createNode (this=0xc22dad8, ah=37064350, akey=..., 
    avalue=..., anextNode=0x2148d78) at /usr/include/qt4/QtCore/qhash.h:548
#_1  0x00007ffff63985bf in QHash<QString, QgsExpressionContextScope::StaticVariable>::insert (this=0xc22dad8, akey=..., avalue=...)
    at /usr/include/qt4/QtCore/qhash.h:763
#_2  0x00007ffff638ff97 in QgsExpressionContextScope::addVariable (this=0xc22dad0, variable=...)
    at /home/webmaster/dev/cpp/QGIS/src/core/qgsexpressioncontext.cpp:92
#_3  0x00007ffff6391f24 in QgsExpressionContextUtils::globalScope () at /home/webmaster/dev/cpp/QGIS/src/core/qgsexpressioncontext.cpp:460
#_4  0x00007ffff66369ab in QgsComposition::createExpressionContext (this=0xb1c1ca0)
    at /home/webmaster/dev/cpp/QGIS/src/core/composer/qgscomposition.cpp:3427
#_5  0x00007ffff6587b84 in QgsComposerObject::createExpressionContext (this=0xbca3090)
    at /home/webmaster/dev/cpp/QGIS/src/core/composer/qgscomposerobject.cpp:201
#_6  0x00007ffff65c7dea in QgsComposerMapGrid::createExpressionContext (this=0xbca3090)
    at /home/webmaster/dev/cpp/QGIS/src/core/composer/qgscomposermapgrid.cpp:2240
#_7  0x00007ffff65bfb8f in QgsComposerMapGrid::draw (this=0xbca3090, p=0x7fffffffb0b0)
    at /home/webmaster/dev/cpp/QGIS/src/core/composer/qgscomposermapgrid.cpp:677
#_8  0x00007ffff65b77d7 in QgsComposerMapItemStack::drawItems (this=0xbc53480, painter=0x7fffffffb0b0)
    at /home/webmaster/dev/cpp/QGIS/src/core/composer/qgscomposermapitem.cpp:200
#_9  0x00007ffff65a9230 in QgsComposerMap::paint (this=0xbca03f0, painter=0x7fffffffb0b0, itemStyle=0xb215c88, pWidget=0x89b3870)
    at /home/webmaster/dev/cpp/QGIS/src/core/composer/qgscomposermap.cpp:422
#_10 0x00007ffff5619deb in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#_11 0x00007ffff55d7b89 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#_12 0x00007ffff568a81d in QGraphicsEffectSource::draw(QPainter*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#_13 0x00007ffff65feac9 in QgsComposerEffect::draw (this=0xbc69de0, painter=0x7fffffffb0b0)
    at /home/webmaster/dev/cpp/QGIS/src/core/composer/qgscomposereffect.cpp:42
#_14 0x00007ffff561aab3 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#_15 0x00007ffff561b396 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4

It's not happening with all map items, I've been able to replicate this issue with one project, unfortunately I can't figure out a way to reduce the project to a size that can be shared.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• assigned_to_id removed Nyall Dawson

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Not enough here to go by - please reopen if you can determine a reproducable way to get this crash.

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• resolution was changed from to not reproducable
• status_id was changed from Open to Closed