Read whole terminal frame at once to avoid console data append glitches

[maxhora]

Fixes console output rendering issues that appear on whole buffer frame update (happens on usage of tmux, mosh).

More details:

• Similar issues happen both for ConPTY and WinPTY on running tmux
• Issue disappears if to increase output std reading buffer. But if to resize the terminal to exceed the buffer the issue come back again.
• "Unexpected" characters appear between calls of _appServiceConnection.SendMessageAsync(CreateMessage(e));
  

Changes in PR read output console stream for whole terminal buffer at once to execute _appServiceConnection.SendMessageAsync only single time per "frame".

[jackluo923]

Is it only me that this merge introduced a bug where upon disconnecting from tmux, the tmux's "bar" at the bottom stays visible until the window is resized?

[maxhora]

@jackluo923 does it happen for you under WSL only? Seems under ssh or mosh the issue is not reproducible

[jackluo923]

@Maxris Thanks for making me aware there are "remote tabs" where we can use ssh or mosh directly. Previously, I have always started WSL in order to ssh and mosh into remote machines. It seems using mosh or ssh directly via FluentTerminal works flawlessly.

So to answer your question, yes this only happens under WSL. Thinking back, this bug could have been introduced by the computer upgrading itself to the latest Windows version during a period when switched to the version on the latest code master branch couple weeks ago.