Fix legend `labelcolor=‘linecolor’` to handle various corner cases, e.g. step histograms and transparent markers#30328

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lukashergt wants to merge 10 commits intomatplotlib:mainfrom

lukashergt:fix-legend-labelcolor-linecolor

Commits on Jul 18, 2025

add tests for various corner cases of legends with `labelcolor` set to `linecolor`, e.g. ensuring that histograms with `step` histtype do not end up with an empty label
lukashergt
committed
fix legends with `labelcolor` set to `linecolor`: change ordering from `c, fc` to `mfc, fc, mec, ec, c`; check if `color` is empty, `none` or transparent and loop on if so
lukashergt
committed
account for the `classic` style in the mpl tests; need to specify `none` for both `c` and `ec` to ensure invisibility, in classic black edges are default
lukashergt
committed
remove unnecessary `loc=1` in new tests for `labelcolor_linecolor`
lukashergt
committed
use `mpl.colors.same_color` also for the `none` checks
lukashergt
committed
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lukashergt
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timhoffm
authored

Commits on Jul 23, 2025

revert to original behaviour of having black legend labels for invisible handles; can pass empty string `" "` to achieve empty/invisible label instead; having a black legend label by default allows…
lukashergt
committed

Commits on Jul 24, 2025