revset: work around x:y range where x or y is wdir()

All revisions must be contiguous in spanset, so we need the special case
for the wdir revision.

mercurial/revset.py

@@ -362,7 +362,13 b' def rangeset(repo, subset, x, y):'
         return baseset()
     m, n = m.first(), n.last()
 
-    if m < n:
+    if m == n:
+        r = baseset([m])
+    elif n == node.wdirrev:
+        r = spanset(repo, m, len(repo)) + baseset([n])
+    elif m == node.wdirrev:
+        r = baseset([m]) + spanset(repo, len(repo) - 1, n - 1)
+    elif m < n:
         r = spanset(repo, m, n + 1)
     else:
         r = spanset(repo, m, n - 1)

tests/test-revset.t

@@ -726,6 +726,16 b' Test working-directory revision'
   9
   2147483647
   $ hg debugrevspec '0:tip and wdir()'
+  $ log '0:wdir()' | tail -3
+  8
+  9
+  2147483647
+  $ log 'wdir():0' | head -3
+  2147483647
+  9
+  8
+  $ log 'wdir():wdir()'
+  2147483647
   $ log '(all() + wdir()) & min(. + wdir())'
   9
   $ log '(all() + wdir()) & max(. + wdir())'