Do not call str.splitlines() twice in the same function. (#628)

Co-authored-by: Sergey Fukanchik <[email protected]>

Author: fukanchik

pylsp/workspace.py

@@ -460,7 +460,8 @@ def apply_change(self, change):
 end_col=change_range["end"]["character"]
 
 # Check for an edit occuring at the very end of the file
-ifstart_line==len(self.lines):
+lines=self.lines
+ifstart_line==len(lines):
 self._source=self.source+text
 return
 
@@ -469,7 +470,7 @@ def apply_change(self, change):
 # Iterate over the existing document until we hit the edit range,
 # at which point we write the new text, then loop until we hit
 # the end of the range and continue writing.
-fori, lineinenumerate(self.lines):
+fori, lineinenumerate(lines):
 ifi<start_line:
 new.write(line)
 continue
@@ -493,10 +494,11 @@ def offset_at_position(self, position):
 
 defword_at_position(self, position):
 """Get the word under the cursor returning the start and end positions."""
-ifposition["line"] >=len(self.lines):
+lines=self.lines
+ifposition["line"] >=len(lines):
 return""
 
-line=self.lines[position["line"]]
+line=lines[position["line"]]
 i=position["character"]
 # Split word in two
 start=line[:i]