[duplicate-code] Ignore decorators lines by similarities checker when…

… ignore signatures flag enabled (#4840)

* [duplicate-code] Ignore decorators lines by similarities checker when ignore signatures flag enabled

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: Maksym Humetskyi <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CONTRIBUTORS.txt

@@ -508,6 +508,7 @@ contributors:
 
 * Maksym Humetskyi (mhumetskyi): contributor
   - Fixed ignored empty functions by similarities checker with "ignore-signatures" option enabled
+  - Ignore function decorators signatures as well by similarities checker with "ignore-signatures" option enabled
 
 * Daniel Dorani (doranid): contributor
 

ChangeLog

@@ -126,6 +126,10 @@ Release date: TBA
 
   * Emit ``consider-using-tuple`` even if list contains a ``starred`` expression.
 
+* Ignore decorators lines by similarities checker when ignore signatures flag enabled
+
+  Closes #4839
+
 
 What's New in Pylint 2.9.6?
 ===========================

pylint/checkers/similar.py

@@ -595,7 +595,7 @@ def stripped_lines(
             chain(
                 *(
                     range(
-                        func.fromlineno,
+                        func.lineno,
                         func.body[0].lineno if func.body else func.tolineno + 1,
                     )
                     for func in functions

tests/checkers/unittest_similar.py

@@ -171,7 +171,7 @@ def test_ignore_signatures_fail():
         == (
             '''
 9 similar lines in 2 files
-==%s:[1:11]
+==%s:[7:17]
 ==%s:[8:18]
        arg1: int = 3,
        arg2: Class1 = val1,
@@ -183,9 +183,19 @@ def test_ignore_signatures_fail():
 
    def example():
        """Valid function definition with docstring only."""
-TOTAL lines=29 duplicates=9 percent=31.03
+
+6 similar lines in 2 files
+==%s:[0:6]
+==%s:[1:7]
+   @deco1(dval1)
+   @deco2(dval2)
+   @deco3(
+       dval3,
+       dval4
+   )
+TOTAL lines=35 duplicates=15 percent=42.86
 '''
-            % (SIMILAR5, SIMILAR6)
+            % (SIMILAR5, SIMILAR6, SIMILAR5, SIMILAR6)
         ).strip()
     )
 
@@ -198,7 +208,7 @@ def test_ignore_signatures_pass():
     assert (
         output.getvalue().strip()
         == """
-TOTAL lines=29 duplicates=0 percent=0.00
+TOTAL lines=35 duplicates=0 percent=0.00
 """.strip()
     )
 

tests/input/similar5

@@ -1,3 +1,9 @@
+@deco1(dval1)
+@deco2(dval2)
+@deco3(
+    dval3,
+    dval4
+)
 def func1(
     arg1: int = 3,
     arg2: Class1 = val1,