Important! How do you visualize Git history? gitk. Having a hard
time resizing the panels? Just look around more carefully, and watch
for when the curor changes.
20160713/http://stackoverflow.com/questions/20389088/gitk-lower-panel-cannot-resize
Also, there’s the related git gui and git-gui commands.
20160713/https://git-scm.com/book/en/v2/Git-in-Other-Environments-Graphical-Interfaces
20160713/https://git-scm.com/docs/gitk