merge from emacs-25 to master lost a line

[Paul Eggert]

The recent merge from emacs-25 to master lost the attached one-line 
spelling fix for test/automated/url-parse-tests.el that was originally 
installed in emacs-25 commit c9dfe5121cb31aa1e8cf352e5088940fc5dd7106 
dated 2015-12-26. This fix was lost even though the commit and change is 
listed in the master branch now. I fixed the problem in master as part 
of commit 61e83e902b388490b609677a76f3d49740439f24 dated 2016-01-04.

Although this particular bug is both minor and fixed now, I worry that 
there may be similar problems elsewhere.

I suspect the problem arose due to the big renaming of tests in commit 
22bbf7ca22f11cc33d887d0162cf2ec6661c3a3e dated 2015-11-23, which renamed 
a bunch of test files, e.g., from test/automated/url-util-tests.el to 
test/lisp/url/url-util-tests.el. It looks like this renaming means that 
if emacs-25 adds a test (under the old naming scheme) and then later 
changes the test (also under the old naming scheme), the later change 
will be lost when be merging to master.

If my analysis is correct, I suggest two things:

* First, when merging to master we have to be careful about the renamed 
tests. I suppose somone (I hope it's not me) could go through all the 
emacs-25 changes to tests renamed in master, and check that the changes 
are properly merged to master.

* Second, to help avoid this problem in the future we should avoid 
making wholesale renames to master right now. They're not worth the 
hassle. That is, it's OK to add stuff to master, but let's not rename 
files in master unless we really need to.


Some nearby problems in master (don't know if they're related): Commits 
8dea6fe5b5bc2936b046e799ea61afc508e28752 and 
b792ecea1715e080ad8e232d3d154b8a25d2edfb (both dated 2015-12-26) both 
have commit logs mentioning test/lisp/url/url-parse-tests.el, but 
neither in fact changes that file. Commit 
1dee11d874de5ff3d5634e1629054c4398b27b72 (also dated 2015-12-26) creates 
the file without the spelling fix.

spellfix.diff
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