This is a follow-up to a previously posted (solved) issue: #1988

Summary: the git blame heat-map (rendered in the left git diff gutter) is not shown all the time -- it would be great to have a setting to ensure it is "aways on".

Currently, when opening a new VScode window or just a new repo, the blame heat-map must be toggled on while focus is on an open file (this works fine). Opening another file tracked by git, we see the blame heat-map appear after a few seonds (also works as expected). However if I close all git-tracked files e.g. whilst working on other files that are not yet git-tracked, and then open any git-tracked file, the blame heat-maps do not show up. They must be toggled on once again.

The setting I use for toggling is gitlens.toggleFileHeatmap, with a keybinding.

@eamodio for viz