This completes vs_3_0 assembler language support.

ME_CommitUndo and ME_CommitCoalescingUndo call ME_SendSelChange, which
may notify the parent window that the selection has changed, therefore
should generally be called after wrapping the text. Otherwise, the parent
window may send a message to the editor and cause an assertion failure.

This provides better backwards compatibility when running with a
32-bit prefix.