Adding upstream version 2.7.upstream/2.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+************************
+Troubleshooting on Linux
+************************
+
+I can’t see any fancy symbols, what’s wrong?
+--------------------------------------------
+
+* Make sure that you’ve configured gvim or your terminal emulator to use 
+  a patched font.
+* You need to set your ``LANG`` and ``LC_*`` environment variables to 
+  a UTF-8 locale (e.g. ``LANG=en_US.utf8``). Consult your Linux distro’s 
+  documentation for information about setting these variables correctly.
+* Make sure that vim is compiled with the ``--with-features=big`` flag.
+* If you’re using rxvt-unicode make sure that it’s compiled with the 
+  ``--enable-unicode3`` flag.
+* If you’re using xterm make sure you have told it to work with unicode. You may 
+  need ``-u8`` command-line argument, ``uxterm`` shell wrapper that is usually 
+  shipped with xterm for this or ``xterm*utf8`` property set to ``1`` or ``2`` 
+  in ``~/.Xresources`` (applied with ``xrdb``). Note that in case ``uxterm`` is 
+  used configuration is done via ``uxterm*…`` properties and not ``xterm*…``.
+
+  In any case the only absolute requirement is launching xterm with UTF-8 
+  locale.
+* If you are using bitmap font make sure that 
+  :file:`/etc/fonts/conf.d/70-no-bitmaps.conf` does not exist. If it does check 
+  out your distribution documentation to find a proper way to remove it (so that 
+  it won’t reappear after update). E.g. in Gentoo this is::
+
+      eselect fontconfig disable 70-no-bitmaps.conf
+
+  (currently this only removes the symlink from :file:`/etc/fonts/conf.d`). Also 
+  check out that no other fontconfig file does not have ``rejectfont`` tag that 
+  tells fontconfig to disable bitmap fonts (they are referenced as not 
+  scalable).
+
+The fancy symbols look a bit blurry or “off”!
+---------------------------------------------
+
+* Make sure that you have patched all variants of your font (i.e. both the 
+  regular and the bold font files).
+
+I am seeing strange blocks in place of playing/paused/stopped signs
+-------------------------------------------------------------------
+
+If you are using ``powerline_unicode7`` :ref:`top-level theme 
+<config-common-default_top_theme>` then symbols for player segments are taken 
+from U+23F4–U+23FA range which is missing from most fonts. You may fix the issue 
+by using `Symbola <http://users.teilar.gr/~g1951d/>`_ font (or any other font 
+which contains these glyphs).
+
+If your terminal emulator is using fontconfig library then you can create 
+a fontconfig configuration file with the following contents:
+
+.. code-block:: xml
+
+    <?xml version="1.0"?>
+    <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+
+    <fontconfig>
+    	<alias>
+    		<family>Terminus</family>
+    		<prefer><family>Symbola</family></prefer>
+    	</alias>
+    </fontconfig>
+
+(replace ``Terminus`` with the name of the font you are using). Exact sequence 
+of actions you need to perform is different across distributions, most likely it 
+will work if you put the above xml into 
+:file:`/etc/fonts/conf.d/99-prefer-symbola.conf`. On Gentoo you need to put it 
+into :file:`/etc/fonts/conf.d/99-prefer-symbola.conf` and run::
+
+    eselect fontconfig enable 99-prefer-symbola
+
+.
+
+.. warning::
+    This answer is only applicable if you use ``powerline_unicode7`` theme or if 
+    you configured powerline to use the same characters yourself.