fix integer underflow bug in ReadConsoleForTermEmulModern() #804
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From directvt/vtm#819 (comment) > When a window resize event is received (terminal generates WINDOW_BUFFER_SIZE_EVENT event when switching between alternate/normal buffer mode), the variable text_len=0 may accidentally decrease by one and become text_len=-1 potentially fixes PowerShell/Win32-OpenSSH#2275
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From directvt/vtm#819 (comment)
potentially fixes PowerShell/Win32-OpenSSH#2275