Merge pull request #479 from blueyed/fix-cached-signature-call

Handle parenthesis with show_call_signatures' cache

test/signatures.vim

@@ -17,10 +17,18 @@ describe 'signatures'
 
         Expect getline(1) == '=`=jedi=0, =`=   (*_*number*_*) =`=jedi=`='
 
-        doautocmd InsertLeave 
+        doautocmd InsertLeave
         Expect getline(1) == ''
     end
 
+    it 'simple after CursorHoldI with only parenthesis'
+        noautocmd normal o
+        doautocmd CursorHoldI
+        noautocmd normal iabs( 
+        doautocmd CursorHoldI
+        Expect getline(1) == '=`=jedi=0, =`=   (*_*number*_*) =`=jedi=`='
+    end
+
     it 'no signature'
         normal ostr 
         Python jedi_vim.show_call_signatures()