ProjectExplorer: Add expensive asserts to FlatModel
ProjectExplorer: Add expensive asserts to FlatModel

Should help in debugging QTCREATORBUG-2821

pcacjr/qt-creator,martyone/sailfish-qtcreator,yinyunqiao/qtcreator,malikcjm/qtcreator,pcacjr/qt-creator,yinyunqiao/qtcreator,bakaiadam/collaborative_qt_creator,Distrotech/qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,KDE/android-qt-creator,renatofilho/QtCreator,bakaiadam/collaborative_qt_creator,bakaiadam/collaborative_qt_creator,duythanhphan/qt-creator,kuba1/qtcreator,jonnor/qt-creator,KDE/android-qt-creator,sandsmark/qtcreator-minimap,farseerri/git_code,darksylinc/qt-creator,azat/qtcreator,kuba1/qtcreator,farseerri/git_code,dmik/qt-creator-os2,sandsmark/qtcreator-minimap,colede/qtcreator,AltarBeastiful/qt-creator,Distrotech/qtcreator,pcacjr/qt-creator,maui-packages/qt-creator,syntheticpp/qt-creator,KDE/android-qt-creator,ostash/qt-creator-i18n-uk,xianian/qt-creator,xianian/qt-creator,AltarBeastiful/qt-creator,yinyunqiao/qtcreator,richardmg/qtcreator,KDAB/KDAB-Creator,jonnor/qt-creator,azat/qtcreator,darksylinc/qt-creator,yinyunqiao/qtcreator,xianian/qt-creator,azat/qtcreator,dmik/qt-creator-os2,KDE/android-qt-creator,duythanhphan/qt-creator,danimo/qt-creator,xianian/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,pcacjr/qt-creator,maui-packages/qt-creator,pcacjr/qt-creator,amyvmiwei/qt-creator,colede/qtcreator,martyone/sailfish-qtcreator,hdweiss/qt-creator-visualizer,Distrotech/qtcreator,duythanhphan/qt-creator,ostash/qt-creator-i18n-uk,colede/qtcreator,bakaiadam/collaborative_qt_creator,renatofilho/QtCreator,sandsmark/qtcreator-minimap,kuba1/qtcreator,malikcjm/qtcreator,hdweiss/qt-creator-visualizer,richardmg/qtcreator,colede/qtcreator,martyone/sailfish-qtcreator,darksylinc/qt-creator,renatofilho/QtCreator,syntheticpp/qt-creator,darksylinc/qt-creator,AltarBeastiful/qt-creator,richardmg/qtcreator,duythanhphan/qt-creator,danimo/qt-creator,KDE/android-qt-creator,martyone/sailfish-qtcreator,hdweiss/qt-creator-visualizer,maui-packages/qt-creator,dmik/qt-creator-os2,bakaiadam/collaborative_qt_creator,danimo/qt-creator,sandsmark/qtcreator-minimap,Distrotech/qtcreator,farseerri/git_code,dmik/qt-creator-os2,yinyunqiao/qtcreator,KDAB/KDAB-Creator,AltarBeastiful/qt-creator,richardmg/qtcreator,danimo/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,dmik/qt-creator-os2,KDAB/KDAB-Creator,maui-packages/qt-creator,danimo/qt-creator,maui-packages/qt-creator,kuba1/qtcreator,bakaiadam/collaborative_qt_creator,omniacreator/qtcreator,omniacreator/qtcreator,duythanhphan/qt-creator,jonnor/qt-creator,duythanhphan/qt-creator,malikcjm/qtcreator,renatofilho/QtCreator,AltarBeastiful/qt-creator,richardmg/qtcreator,AltarBeastiful/qt-creator,farseerri/git_code,syntheticpp/qt-creator,omniacreator/qtcreator,maui-packages/qt-creator,renatofilho/QtCreator,ostash/qt-creator-i18n-uk,kuba1/qtcreator,Distrotech/qtcreator,kuba1/qtcreator,colede/qtcreator,malikcjm/qtcreator,dmik/qt-creator-os2,AltarBeastiful/qt-creator,xianian/qt-creator,KDE/android-qt-creator,darksylinc/qt-creator,malikcjm/qtcreator,jonnor/qt-creator,pcacjr/qt-creator,Distrotech/qtcreator,jonnor/qt-creator,amyvmiwei/qt-creator,syntheticpp/qt-creator,syntheticpp/qt-creator,KDAB/KDAB-Creator,ostash/qt-creator-i18n-uk,kuba1/qtcreator,amyvmiwei/qt-creator,renatofilho/QtCreator,martyone/sailfish-qtcreator,omniacreator/qtcreator,maui-packages/qt-creator,KDE/android-qt-creator,KDE/android-qt-creator,jonnor/qt-creator,xianian/qt-creator,danimo/qt-creator,azat/qtcreator,hdweiss/qt-creator-visualizer,pcacjr/qt-creator,darksylinc/qt-creator,farseerri/git_code,omniacreator/qtcreator,danimo/qt-creator,kuba1/qtcreator,farseerri/git_code,sandsmark/qtcreator-minimap,hdweiss/qt-creator-visualizer,hdweiss/qt-creator-visualizer,duythanhphan/qt-creator,omniacreator/qtcreator,colede/qtcreator,xianian/qt-creator,xianian/qt-creator,darksylinc/qt-creator,ostash/qt-creator-i18n-uk,amyvmiwei/qt-creator,azat/qtcreator,KDAB/KDAB-Creator,syntheticpp/qt-creator,malikcjm/qtcreator,bakaiadam/collaborative_qt_creator,farseerri/git_code,omniacreator/qtcreator,darksylinc/qt-creator,malikcjm/qtcreator,amyvmiwei/qt-creator,syntheticpp/qt-creator,yinyunqiao/qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,richardmg/qtcreator,KDAB/KDAB-Creator,martyone/sailfish-qtcreator,richardmg/qtcreator,yinyunqiao/qtcreator,xianian/qt-creator,ostash/qt-creator-i18n-uk,AltarBeastiful/qt-creator,ostash/qt-creator-i18n-uk,sandsmark/qtcreator-minimap,dmik/qt-creator-os2,azat/qtcreator,danimo/qt-creator,colede/qtcreator