Fix the bug mentioned in the previous commit

Author: stefanhaller

pkg/gui/controllers/commits_files_controller.go

@@ -292,7 +292,8 @@ func (self *CommitFilesController) openCopyMenu() error {
 
 func (self *CommitFilesController) checkout(node *filetree.CommitFileNode) error {
 	self.c.LogAction(self.c.Tr.Actions.CheckoutFile)
-	if err := self.c.Git().WorkingTree.CheckoutFile(self.context().GetRef().RefName(), node.GetPath()); err != nil {
+	_, to := self.context().GetFromAndToForDiff()
+	if err := self.c.Git().WorkingTree.CheckoutFile(to, node.GetPath()); err != nil {
 		return err
 	}
 

pkg/integration/tests/commit/checkout_file_from_range_selection_of_commits.go

@@ -51,9 +51,6 @@ var CheckoutFileFromRangeSelectionOfCommits = NewIntegrationTest(NewIntegrationT
 				Equals("M  file.txt"),
 			)
 
-		/* EXPECTED:
 		t.FileSystem().FileContent("file.txt", Equals("three\n"))
-		ACTUAL: */
-		t.FileSystem().FileContent("file.txt", Equals("two\n"))
 	},
 })