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Fix #260: check if TikZ external is loaded
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@ -126,7 +126,15 @@
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% \end{macrocode}
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%
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% To avoid generating externalized figures of the progressbar we have to disable
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% them with ``tikzexternalenable'' and ``tikzexternaldisable''. However, if the
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% ``external'' libray is not loaded we would get undefined control sequence
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% problems, hence we define them as no-ops if they are not defined yet.
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%
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% \begin{macrocode}
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\ifx\tikzexternalenable\undefined \newcommand{\tikzexternalenable}{} \fi
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\ifx\tikzexternaldisable\undefined \newcommand{\tikzexternaldisable}{} \fi
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% \end{macrocode}
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%
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% \subsubsection{Component sub-packages}
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%
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