Fixed line select in gutter when text marks are not visible
Fixed line select in gutter when text marks are not visible

The ProjectFilesEditor used for editing the generic project's files does
not show text marks, which broke the line select in the gutter.

Task-number: QTCREATORBUG-1238
Reviewed-by: mae

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