fixes issue spyder-ide#3800

If the previous line is unindented, the next one will be aswell.

spyder/widgets/sourcecode/codeeditor.py

@@ -1917,14 +1917,13 @@ def fix_indent(self, forward=True, comment_or_string=False):
         diff_curly = 0
         add_indent = False
         prevline = None
+        if not self.get_block_indentation(block_nb - 1):
+            return False
         for prevline in range(block_nb-1, -1, -1):
             cursor.movePosition(QTextCursor.PreviousBlock)
             prevtext = to_text_string(cursor.block().text()).rstrip()
-
-            if ((self.is_python_like() 
-                 and not prevtext.strip().startswith('#')
-                 and prevtext) 
-                or prevtext):
+
+            if prevtext:
 
                 if (prevtext.strip().endswith(')')
                     or prevtext.strip().endswith(']')