When I modified bug01 when suddenly a bug02, and bug02 higher priority than bug01, but I can not submit an unmodified finished bug01 the code, this time you can use git stash to modify bug01 into the staging area, and then you modify after bug02 and push, can be placed on a git stash pop version of the code the temporary area into the current work area code.
PS: you can can see where all the staging area code version with git stash list. Then git stash apply stash @ {0} based on the index to select the code version combined temporary area. Come on!