TreeViewFind: Optimize speed by not creating a QTextDocument per index
TreeViewFind: Optimize speed by not creating a QTextDocument per index

Change-Id: I74027b051d85698d95f92cb212182281013d256c
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@digia.com>

amyvmiwei/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,danimo/qt-creator,danimo/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,Distrotech/qtcreator,kuba1/qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,maui-packages/qt-creator,xianian/qt-creator,maui-packages/qt-creator,farseerri/git_code,kuba1/qtcreator,kuba1/qtcreator,maui-packages/qt-creator,farseerri/git_code,maui-packages/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,xianian/qt-creator,danimo/qt-creator,danimo/qt-creator,maui-packages/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,maui-packages/qt-creator,xianian/qt-creator,maui-packages/qt-creator,Distrotech/qtcreator,farseerri/git_code,farseerri/git_code