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conpty exhibits pathological performance on scrolling region redraw (repaints entire screen) #7019

@izghitu

Description

@izghitu

Environment

Windows build number: Win32NT             10.0.18362.0 Microsoft Windows NT 10.0.18362.0
Windows Terminal version (if applicable): latest

Steps to reproduce

ssh into a remote host, execute a command that spits a lot of output

Expected behavior

In putty when the connection to a remote host is slow and a command spits a lot of output and that output comes back in frames(due to the slow connection) then I can just fine switch between SCREEN tabs. In windows terminal this is not possible. I am not even able to switch between tabs of the windows terminal until the command previous executed does not finish its output.

Actual behavior

Need to wait for full command output before I can do anything else in the windows terminal.

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    Area-PerformancePerformance-related issueIssue-BugIt either shouldn't be doing this or needs an investigation.Needs-Tag-FixDoesn't match tag requirementsPriority-2A description (P2)Product-ConptyFor console issues specifically related to conpty

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