bug - cell and colour

[Sveinung58]

If you inside a calstable cell (\cell{}) issue a colour-command for foreground colour
(\cell{\color{green}Testing} the colour will leak outside the cell, colourising not only the rest of the tabular and its rules (borders), but also the rest of the document. According to Stackexchange user, Ulrike Fischer, (see her comments to this answer at Stackexchange) the reason is that cals does not use "colour-safe" boxing commands.

I believe this may be a similar issue as described in David Carlisle's answers in these two answers:

1. Why does a color meant for the first typeset line only (with package magaz) affect the entire document?
2. [\setbox vs. \sbox and \savebox - What are the differences I need to know about?] (https://tex.stackexchange.com/a/46483/9632)

[olpa]

Thanks, I'll re-check the issue. I expected that colour-safe boxes add whatis-boxes, and it is fatal for cals, which re-builds the internal structure of boxes. I hope I'm wrong.

[Sveinung58]

Thank you for your feed back.

Work-arounds are using \cell{\textcolor{<colour>}{Cell text}} or extra grouping inside the cell, \cell{{\color{<colour>}Cell text}}.

However, fiddling around with color{<colour>} different places inside, discloses some surprising effect on foreground text and rules.

Maybe a solution is to implement a cals@fgcolor{}-command, similar to the cals@bgcolor{}-command.

"Poor mans" arraycolor for cals is issuing a color{<colour>} outside the calstable, and use a textcolor{<textcolour>}{Cell text} in each cell. Using \cals@AtBeginCell colourise the inside table rules in addition to the text.