hgview #17933 have an "open repository" button/action somewhere [in-progress]

working from consoles is quite clumsy in windows (esp. if there's a trick to make a process launch in the background I'd like to learn it) so having a fancy button opening a directory chooser would be nice

appeared in<not specified>
done in1.9.0
load left1.000
closed by<not specified>
patch[qt] add an open button to change the repository (closes #17933) [folded]