[BRLTTY] No update switching to console controlled by brlapi client

[Peter Nilsson Lundblad]

Hi,

This is a regression in latest trunk (r8349) as compared to brltty 4.5.
On Linux kernel 3.2.5, Ubuntu precies (12.04).


Steps to reproduce:
1. Have brltty running and confirmed to be working on a text console.
2. Start a brlapi client (such as orca) on e.g. an X console.
3. Switch to the text console.  Confirm display content.
4. Switch to the brlapi controlled console.  Conform display content.
5. Take an action that would cause the brlapi client to update the
   display content (such as typing in a terminal if testing with orca).

Observed result:
In step 3: the display updates to the content of the console.
In step 4: the display content is not updated.
In step 5: Display updates according to the brlapi change.

Expected behaviour:
In step 4: the display should be updated to reflect the last content
written by the api client.

Notes:
- this fails both if the console is in graphics mode (with X and orca)
  or when using an api client in a text mode console.
- If there's no api client in a graphical console, the
  'screen not in text mode' message shows up when switching to the console as
  expected.

Thanks,
//Peter