implement is_invalid detection

lua/cmp/entry.lua

@@ -562,4 +562,15 @@ entry.convert_range_encoding = function(self, range)
   end)
 end
 
+---Return true if the entry is invalid.
+entry.is_invalid = function(self)
+  local is_invalid = false
+  is_invalid = is_invalid or misc.empty(self.completion_item.label)
+  if self.completion_item.textEdit then
+    local range = self.completion_item.textEdit.range or self.completion_item.textEdit.insert
+    is_invalid = is_invalid or range.start.line ~= range['end'].line
+  end
+  return is_invalid
+end
+
 return entry

lua/cmp/source.lua

@@ -353,13 +353,15 @@ source.complete = function(self, ctx, callback)
 
         self.status = source.SourceStatus.COMPLETED
         self.entries = {}
-        for i, item in ipairs(response.items or response) do
+        for _, item in ipairs(response.items or response) do
           if (item or {}).label then
             local e = entry.new(ctx, self, item, response.itemDefaults)
-            self.entries[i] = e
+            if not e:is_invalid() then
+              table.insert(self.entries, e)
               self.offset = math.min(self.offset, e:get_offset())
             end
           end
+        end
         self.revision = self.revision + 1
         if #self.entries == 0 then
           self.offset = old_offset