Add `use_non_breaking_spaces` theme option, use it in ascii theme

docs/source/configuration/reference.rst

@@ -287,6 +287,19 @@ ascii                       Theme without any unicode characters at all
     after it (on the left side). These spaces will not be added if divider is 
     not drawn.
 
+``use_non_breaking_spaces``
+    Determines whether non-breaking spaces should be used in place of the 
+    regular ones. This option is needed because regular spaces are not displayed 
+    properly when using powerline with some font configuration. Defaults to 
+    ``True``.
+
+    .. note::
+       Unlike all other options this one is only checked once at startup using 
+       whatever theme is :ref:`the default <config-ext-theme>`. If this option 
+       is set in the local themes it will be ignored. This option may also be 
+       ignored in some bindings.
+
+
 ``dividers``
     Defines the dividers used in all Powerline extensions. This option 
     should usually only be changed if you don't have a patched font, or if 

powerline/config_files/themes/ascii.json

@@ -1,4 +1,5 @@
 {
+	"use_non_breaking_spaces": false,
 	"dividers": {
 		"left": {
 			"hard": " ",

powerline/lint/__init__.py

@@ -1388,6 +1388,7 @@ common_theme_spec = Spec(
 top_theme_spec = common_theme_spec().update(
 	dividers=dividers_spec(),
 	spaces=spaces_spec(),
+	use_non_breaking_spaces=Spec().type(bool).optional(),
 	segment_data=Spec().unknown_spec(
 		Spec().func(check_segment_data_key),
 		segment_data_value_spec(),

powerline/renderer.py

@@ -73,7 +73,7 @@ class Renderer(object):
 		python-2) regular string or ``None``.
 	'''
 
-	character_translations = {ord(' '): NBSP}
+	character_translations = {}
 	'''Character translations for use in escape() function.
 
 	See documentation of ``unicode.translate`` for details.
@@ -101,6 +101,9 @@ class Renderer(object):
 		self.theme_config = theme_config
 		theme_kwargs['pl'] = pl
 		self.pl = pl
+		if theme_config.get('use_non_breaking_spaces', True):
+			self.character_translations = self.character_translations.copy()
+			self.character_translations[ord(' ')] = NBSP
 		self.theme = Theme(theme_config=theme_config, **theme_kwargs)
 		self.local_themes = local_themes
 		self.theme_kwargs = theme_kwargs
@@ -442,11 +445,10 @@ class Renderer(object):
 					segment['_rendered_hl'] = contents_highlighted
 			yield segment
 
-	@classmethod
-	def escape(cls, string):
+	def escape(self, string):
 		'''Method that escapes segment contents.
 		'''
-		return string.translate(cls.character_translations)
+		return string.translate(self.character_translations)
 
 	def hlstyle(fg=None, bg=None, attr=None):
 		'''Output highlight style string.

tests/test_local_overrides.vim

@@ -30,7 +30,7 @@ catch
 	cquit
 endtry
 
-if result isnot# '%#Pl_22_24320_148_11523840_bold# NORMAL %#Pl_148_11523840_236_3158064_NONE# %#Pl_231_16777215_236_3158064_NONE#                                                 %#Pl_247_10395294_236_3158064_NONE#unix%#Pl_240_5789784_236_3158064_NONE# %#Pl_247_10329757_240_5789784_NONE# 100%%%#Pl_252_13684944_240_5789784_NONE# %#Pl_235_2500134_252_13684944_NONE# LN %#Pl_235_2500134_252_13684944_bold#  1%#Pl_22_24576_252_13684944_NONE#:1  '
+if result isnot# '%#Pl_22_24320_148_11523840_bold# NORMAL %#Pl_148_11523840_236_3158064_NONE# %#Pl_231_16777215_236_3158064_NONE#                                                 %#Pl_247_10395294_236_3158064_NONE#unix%#Pl_240_5789784_236_3158064_NONE# %#Pl_247_10329757_240_5789784_NONE# 100%%%#Pl_252_13684944_240_5789784_NONE# %#Pl_235_2500134_252_13684944_NONE# LN %#Pl_235_2500134_252_13684944_bold#  1%#Pl_22_24576_252_13684944_NONE#:1  '
 	call writefile(['Unexpected result', result], 'message.fail')
 	cquit
 endif

tests/test_shells/ipython.ok

@@ -1,14 +1,14 @@
 
- In [2]  bool 42
-     2>  bool(42)
- Out[2]  True
+ In [2]  bool 42
+     2>  bool(42)
+ Out[2]  True
 
- In [3]  bool 44
-     3>  bool(44)
- Out[3]  True
+ In [3]  bool 44
+     3>  bool(44)
+ Out[3]  True
 
- In [4]  class Test(object):
-             pass
-         
+ In [4]  class Test(object):
+             pass
+         
 
- In [5]  exit
+ In [5]  exit