hgview #139686 "display diff from there" with precursor and new file [in-progress]

hg init
echo a > a
hg add a
hg ci -m 'a'
echo b >> a
hg ci -m 'a+b' --amend

then display hiddens, select last, request "diff from there" with precursor: no diff shown as it is a new file.

prioritynormal
typebug
done in1.9.0
load1.000
load left1.000
closed by<not specified>
patch[qt] do not select revision on left click on revisions tree graph [folded][qt] make "go to ancestor revision" more visible [folded][qt] make "go to ancestor revision" more visible [applied][qt] do not select revision on left click on revisions tree graph [applied][qt] make "go to ancestor revision" more visible [rejected][qt] do not select revision on left click on revisions tree graph [rejected]