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A server attempt to resize the window (for instance via DECCOLM) when "When window is resized" was set to "Forbid resizing completely" would cause all terminal output to be suspended, due to the resize attempt never being acknowledged. (There are other code paths like this, which I've fixed for completeness, but I don't think they have any effect: the terminal filters out resize attempts to the current size before this point, and even if a server can get such a request through the SUPDUP protocol, the test for that is wrong and will never fire -- this needs fixing separately.)