Try to fix col adjustment (#843)

* Try to fix col adjuastment

* Improve duplicated text handling

lua/cmp/entry.lua

@@ -260,10 +260,12 @@ entry.get_vim_item = function(self, suggest_offset)
     end
 
     -- remove duplicated string.
-    for i = 1, #word - 1 do
-      if str.has_prefix(self.context.cursor_after_line, string.sub(word, i, #word)) then
-        word = string.sub(word, 1, i - 1)
-        break
+    if self:get_offset() ~= self.context.cursor.col then
+      for i = 1, #word - 1 do
+        if str.has_prefix(self.context.cursor_after_line, string.sub(word, i, #word)) then
+          word = string.sub(word, 1, i - 1)
+          break
+        end
       end
     end