- fixed and consolitate the duplicated code for sending the
CLOSE_REQUEST_PDU to the server into dvcman_close_channel
- call dvcman_close_channel if a dynamic channel plugin fails
to process the received channel data
- rdpegfx: don't try to remove a non-existing cache entry,
return an error instead which now will close the channel, as
expected by Microsoft's windows protocols test suite
Although Microsoft uses 1-based numbering on the wire for indexing the
GFX bitmap cache entries, the code in FreeRDP uses 0-based numbering and
therefore the name MaxCacheSlots is less confusing.
Weird but Microsoft uses 1-based indexing in the RDPGFX bitmap
cache PDU's.
This does not seem to be documented but can be deducted from the
RDP client test code in Microsoft's "Windows Protocol Test Suites"
GitHub repository and the observation that mstsc aborts with a
protocol error if the cacheSlot index value 0 is used in e.g. a
GFX surface to cache PDU.
Since ec027bf dynamic resolution is broken when used with egfx. Before that commit
we were tracking a server sent resize by setting a DesktopResize callback. This callback
is called when the desktop is resized by the server. Anyway the problem was that when this
callback is called, the activation sequence is not always completed, which were leading to
some freeze with 2012r2 servers (sending packets before the sequence is finished).
So with the faulty commit, we are tracking server resizes by subscribing to the Actived
event, that is called at the end of a reactivation sequence, so we're sure to not send packets
when not fully activated.
Anyway the issue that shows on (#4330) is that when you use egfx, no reactivation sequence happens,
the server only sends a ResetGraphics message with the new size, and so we miss the resized event.
This fix introduces a new GraphicsReset event, makes the display channel subscribe to that event,
and react accordingly.
Added some checks so that when setting a cache entry fails, we close connection (or
we fail later when trying to use that empty entry).
The small cache egfx capability has also been fixed.
