QuickToolBar: refine gradient editing
QuickToolBar: refine gradient editing

This patch solves minor usablity issues
in the gradient editing.

Reviewed-by: Lasse Holmstedt

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