It's easy to try it out. kdepim/kmail/folderview.cpp , line 180, change
//setAutoExpandDelay( gDNDAutoExpandDelay ); setAutoExpandDelay( -1 );
to
setAutoExpandDelay( gDNDAutoExpandDelay ); //setAutoExpandDelay( -1 );
and rebuild.
It's easy to try it out. kdepim/ kmail/foldervie w.cpp , line 180, change
//setAutoExpa ndDelay( gDNDAutoExpandDelay ); Delay( -1 );
setAutoExpand
to
setAutoExpand Delay( gDNDAutoExpandDelay ); ndDelay( -1 );
//setAutoExpa
and rebuild.