Undraw the cursor before (possibly) deleting the cursor's text property.

Undraw the cursor before (possibly) deleting the cursor's text property.

Mon Aug  3 19:24:48 1998  Owen Taylor  <otaylor@redhat.com>

 	* gtk/gtktext.c (gtk_text_forward_delete): Undraw the
 	  cursor before (possibly) deleting the cursor's text
 	  property.

 	* gtk/gtktext.c (correct_cache_delete): More attempts
 	  to clean the line-start cache up after inserting
 	  a property. Among other things, make sure to
 	  fix up text->current_line, since it is used to
 	  refetch the changed lines.