fixup! Add command to open git difftool

Support difftool for commits.

pkg/gui/controllers/basic_commits_controller.go

@@ -76,6 +76,11 @@ func (self *BasicCommitsController) GetKeybindings(opts types.KeybindingsOpts) [
 			Handler:     self.c.Helpers().CherryPick.Reset,
 			Description: self.c.Tr.ResetCherryPick,
 		},
+		{
+			Key:         opts.GetKey(opts.Config.Universal.OpenDiffTool),
+			Handler:     self.checkSelected(self.openDiffTool),
+			Description: self.c.Tr.OpenDiffTool,
+		},
 	}
 
 	return bindings
@@ -251,3 +256,11 @@ func (self *BasicCommitsController) copy(commit *models.Commit) error {
 func (self *BasicCommitsController) copyRange(*models.Commit) error {
 	return self.c.Helpers().CherryPick.CopyRange(self.context.GetSelectedLineIdx(), self.context.GetCommits(), self.context)
 }
+
+func (self *BasicCommitsController) openDiffTool(commit *models.Commit) error {
+	to := commit.RefName()
+	from, reverse := self.c.Modes().Diffing.GetFromAndReverseArgsForDiff(commit.ParentRefName())
+	_, err := self.c.RunSubprocess(self.c.Git().File.OpenDiffToolCmdObj(
+		from, to, reverse, ".", true))
+	return err
+}