Handle opening browser with opener crate
#5888
Merged
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Fixes #5701
A note about behavior on Linux:
When looking for a browser to open the docs with, Cargo currently tries the
$BROWSERenvironment variable,xdg-open,gnome-open, and finallykde-open, in that order. With this commit, this behavior changes; theopenercrate always uses thexdg-openscript, which is included in theopenercrate. Thexdg-openscript takes care of finding a suitable browser.