=== modified file 'plugin/UltiSnips.vim'
--- old/plugin/UltiSnips.vim	2009-10-13 07:56:12 +0000
+++ new/plugin/UltiSnips.vim	2010-07-11 21:07:19 +0000
@@ -40,12 +40,23 @@
 " }}}
 
 "" FUNCTIONS {{{
+function! CompensateForPUM()
+  """ The CursorMovedI event is not triggered while the popup-menu is visible,
+  """ and it's by this event that UltiSnips updates its vim-state. The fix is
+  """ to explicitly check for the presence of the popup menu, and update
+  """ the vim-state accordingly.
+ if pumvisible()
+    py UltiSnips_Manager.cursor_moved()
+ endif
+endfunction
+
 function! UltiSnips_ExpandSnippet()
  py UltiSnips_Manager.expand()
  return ""
 endfunction
 
 function! UltiSnips_ExpandSnippetOrJump()
+ call CompensateForPUM()
  py UltiSnips_Manager.expand_or_jump()
  return ""
 endfunction
@@ -56,11 +67,13 @@
 endfunction
 
 function! UltiSnips_JumpBackwards()
+ call CompensateForPUM()
  py UltiSnips_Manager.jump_backwards()
  return ""
 endfunction
 
 function! UltiSnips_JumpForwards()
+ call CompensateForPUM()
  py UltiSnips_Manager.jump_forwards()
  return ""
 endfunction

=== modified file 'test.py'
--- old/test.py	2009-10-13 07:56:12 +0000
+++ new/test.py	2010-07-11 20:33:26 +0000
@@ -1059,6 +1059,24 @@
     wanted = "superkallifragilistik\nsuperkallifragilistik some more " \
             "superkallifragilistik some more"
 
+# We need >2 different words with identical starts to create the
+# popup-menu:
+COMPLETION_OPTIONS = "completion1\ncompletion2\n"
+
+class Completion_ForwardsJumpWithoutCOMPL_ACCEPT(_VimTest):
+    # completions should not be truncated when JF is activated without having
+    # pressed COMPL_ACCEPT (Bug #598903)
+    snippets = ("test", "$1 $2")
+    keys = COMPLETION_OPTIONS + "test" + EX + "com" + COMPL_KW + JF + "foo"
+    wanted = COMPLETION_OPTIONS + "completion1 foo"
+
+class Completion_BackwardsJumpWithoutCOMPL_ACCEPT(_VimTest):
+    # completions should not be truncated when JB is activated without having
+    # pressed COMPL_ACCEPT (Bug #598903)
+    snippets = ("test", "$1 $2")
+    keys = COMPLETION_OPTIONS + "test" + EX + "foo" + JF + "com" + COMPL_KW + \
+           JB + "foo"
+    wanted = COMPLETION_OPTIONS + "foo completion1"
 
 ###################
 # SNIPPET OPTIONS #