If a ColumnSetWrapperFrame already has column-span children,
ColumnSetWrapperFrame::GetContentInsertionFrame() will return itself to
let WipeContainingBlock() aware this is the case to reframe.
To make this work, we need to move the reframe condition prior to check
NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR bit because the top level
ColumnSetWrapperFrame never has NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR bit
set.
Differential Revision: https://phabricator.services.mozilla.com/D14819
--HG--
extra : moz-landing-system : lando
Ting-Yu Lin