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.

We *might* need to ignore POLLERR messages for UDP sockets, as the
condition is actually temporary and sock_try_event was hiding this.