eol: stop after first matched rule in hook (issue2660)

When matching a file against the rules in .hgeol, the eol extension's
hook should stop after the first matching rule is encountered.
Otherwise, if this rule is contradicted by other more general rule
(for example a catch-all at the end of .hgeol), some files are simply
impossible to push. Trivial example:

  **.bat = CRLF
  **     = LF

If all matching rules were applied, a .bat file would be rejected
either because it has LFs (first rule) or because it has CRLFs (second
rule).

hgext/eol.py

@@ -144,6 +144,8 b' def hook(ui, repo, node, hooktype, **kwa'
                 elif target == "to-crlf" and singlelf.search(data):
                     raise util.Abort(_("%s should not have LF line endings")
                                      % f)
+                # Ignore other rules for this file
+                break
 
 
 def preupdate(ui, repo, hooktype, parent1, parent2):

tests/test-eol-hook.t

@@ -21,6 +21,7 b' Create repo'
   $ cat > .hgeol <<EOF
   > [patterns]
   > mixed.txt = BIN
+  > crlf.txt = CRLF
   > **.txt = native
   > EOF
   $ hg add .hgeol
@@ -61,3 +62,29 b' Create repo'
   adding manifests
   adding file changes
   added 2 changesets with 2 changes to 1 files
+
+  $ printf "first\nsecond\nthird\n" > crlf.txt
+  $ hg add crlf.txt
+  $ hg commit -m 'LF crlf.txt'
+  $ hg push ../main
+  pushing to ../main
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  error: pretxnchangegroup hook failed: crlf.txt should not have LF line endings
+  transaction abort!
+  rollback completed
+  abort: crlf.txt should not have LF line endings
+  [255]
+
+  $ printf "first\r\nsecond\r\nthird\r\n" > crlf.txt
+  $ hg commit -m 'CRLF crlf.txt (fixed)'
+  $ hg push ../main
+  pushing to ../main
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 1 files