Rewrite computation of max and min in dataframe editor #3353
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The main goal for this PR is to fix an unhandled exception in
update_min_max_col()
in the dataframe editor, which is triggered by dataframes with either categorical data or with timezone-aware timestamps.I ended up completely rewriting the function so that it only compute the max and min of columns where the results are actually used (in order to set the background colour), because there were some details of the old implementation that I did not quite understand (handling of complex numbers). I also added tests, expanded the docstring, and did some clean-up in related routines.
Fixes #2940 and #3308.