message: Don't clamp length against buffer size after applying offset
  * If we have a given view length that fits in the buffer, we shouldn't apply the
  offset before clamping. Instead we apply the offset on the buffer length if
  that's what we're using as our size.
diff: @@ -2494,10 +2494,17 @@ void BufferViewer::OnEventChanged(uint32_t eventId)
  if(unclampedLen == UINT64_MAX)
  unclampedLen = 0;
  if(unclampedLen == 0)
  - unclampedLen = m_IsBuffer ? m_Ctx.GetBuffer(m_BufferID)->length : 0;
  + {
  + uint64_t bufLen = m_IsBuffer ? m_Ctx.GetBuffer(m_BufferID)->length : 0;
  + uint64_t bufOffs = CurrentByteOffset();
  +
  + if(bufOffs >= bufLen)
  + unclampedLen = 0;
  + else
  + unclampedLen = bufLen - bufOffs;
  + }
  - uint64_t clampedLen =
  - qMin(unclampedLen - CurrentByteOffset(), uint64_t(buf->stride * (MaxVisibleRows + 2)));
  + uint64_t clampedLen = qMin(unclampedLen, uint64_t(buf->stride * (MaxVisibleRows + 2)));
  if(m_IsBuffer)
  {
  