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What is the good way to display errors in the console via \PackageError when this command is used inside \ExplSyntaxOn ... \ExplSyntaxOff because for the moment the spaces in the messages are not displayed (I know that is normal) ?

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    ~ is a space within ExplSyntax – David Carlisle Aug 31 '20 at 13:40
  • Thanks a lot (take a look at your github tkz-tab 😆) – projetmbc Aug 31 '20 at 13:43
  • Alain has resumed work on the tkz- files the github isn't really "mine" even though I set it up. if you report an issue there Alain should get to it at some point. – David Carlisle Aug 31 '20 at 13:46
  • That was just a joke. :-) – projetmbc Aug 31 '20 at 13:47
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~ is a space within ExplSyntax

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    But it should be noted that it is not a space at the beginning of a line (and a newline is not a space either) Therefore, if you put the text over several lines you have to add the ~ at the end of the line not at the beginning of the next --- this is due to the way TeX drops newlines. – Frank Mittelbach Sep 2 '20 at 8:33

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