From b80d018c079f39d5d7325231dedd311635d8a2c5 Mon Sep 17 00:00:00 2001
From: Timothy Crosley <timothy.crosley@gmail.com>
Date: Sun, 10 Mar 2019 21:57:30 -0700
Subject: Fix handling of whitespace character

---
 CHANGELOG.md   |  2 ++
 isort/isort.py |  4 ++--
 test_isort.py  | 13 +++++++++++++
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66e88cc1..85638132 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@ Changelog
 =========
 ### 4.3.15 - March 10, 2019 - hot fix release
 - Fixed a regression with handling streaming input from pipes (Issue #895)
+- Fixed handling of \x0c whitespace character (Issue #811)
+- Improved CLI documentation
 
 ### 4.3.14 - March 9, 2019 - hot fix release
 - Fixed a regression with */directory/*.py style patterns
diff --git a/isort/isort.py b/isort/isort.py
index ac21230f..adc64ab3 100644
--- a/isort/isort.py
+++ b/isort/isort.py
@@ -223,8 +223,8 @@ class SortImports(object):
             check_output = self.output
             check_against = file_contents
             if self.config['ignore_whitespace']:
-                check_output = check_output.replace(self.line_separator, "").replace(" ", "")
-                check_against = check_against.replace(self.line_separator, "").replace(" ", "")
+                check_output = check_output.replace(self.line_separator, "").replace(" ", "").replace("\x0c", "")
+                check_against = check_against.replace(self.line_separator, "").replace(" ", "").replace("\x0c", "")
 
             if check_output.strip() == check_against.strip():
                 if self.config['verbose']:
diff --git a/test_isort.py b/test_isort.py
index 58d27d17..8c157c4e 100644
--- a/test_isort.py
+++ b/test_isort.py
@@ -2875,3 +2875,16 @@ def test_to_ensure_empty_line_not_added_to_file_start_issue_889():
                   '# comment2\n'
                   'import sys\n')
     assert SortImports(file_contents=test_input).output == test_input
+
+
+def test_to_ensure_correctly_handling_of_whitespace_only_issue_811(capsys):
+    test_input = ('import os\n'
+                  'import sys\n'
+                  '\n'
+                  '\x0c\n'
+                  'def my_function():\n'
+                  '    print("hi")\n')
+    SortImports(file_contents=test_input, ignore_whitespace=True)
+    out, err = capsys.readouterr()
+    assert out == ''
+    assert err == ''
-- 
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