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069f7c8b21
This is the first bug found as a direct result of writing that terminal test program - I added some tests for things I expected to work already, and some of them didn't, proving immediately that it was a good idea! If the terminal is one column wide, and you've printed a character (hence, set the wrapnext flag), what should backspace do? Surely it should behave like any other backspace with wrapnext set, i.e. clear the wrapnext flag, returning the cursor's _logical_ position to the location of the most recently printed character. But in fact it was anti-wrapping to the previous line, because I'd got the cases in the wrong order in the if-else chain that forms the backspace handler. So the handler for 'we're in column 0, wrapping time' was coming before 'wrapnext is set, just clear it'. Now wrapnext is checked _first_, before checking anything at all. Any time we can just clear that, we should.