SwRangeRedline::Hide() will copy and delete the redlined text range,
and during the delete it happens that FLY_AS_CHAR frames are not deleted
before their anchor SwTxtNode is destroyed, so SwFmtAnchor::m_pCntntAnchor
will have its NodeIndex adjusted by SwNodes::RemoveNode() to a wrong
node and then it cannot call RemoveAnchoredFly() on the proper node.

Avoid the problem by manually deleting all FLY_AS_CHAR from nodes
before they are deleted and before the SwNodeIndex adjustment.

(regression from 738fb2ad, which had
 the equivalent problem with differing SwNodeIndex keys)

Change-Id: I13c9577c01e3b8976b74fb9c58dc2ef2c2fc0666