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@@ -25,7 +25,7 @@ IS_WINDOWS = platform.system() == 'Windows'
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ITERM_PROFILE = os.environ.get('ITERM_PROFILE')
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TERM = os.environ.get('TERM')
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-TERM_IS_SCREEN = TERM.startswith('screen')
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+TERM_IS_SCREEN = TERM and TERM.startswith('screen')
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# tmux requires unrecognized OSC sequences to be wrapped with DCS tmux;
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# <sequence> ST, and for all ESCs in <sequence> to be replaced with ESC ESC.
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