[meld] sourceview: Make inline-highlighted text show whitespace (bgo#589366)

[Kai Willadsen <kaiw src gnome org>]

commit f46b302fa4a8c03036029e4d0361c7d10147b824
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Nov 19 11:04:32 2017 +1000

    sourceview: Make inline-highlighted text show whitespace (bgo#589366)
    
    The rationale here is that if your differences include whitespace, it's
    probably best that you be able to see the whitespace characters. The
    downside is that under normal GtkSourceView themes, the whitespace
    indicators are quite low-contrast, so between that and the coloured
    background in these chunks, the indicators are very difficult to see.
    
    This is being included on a provisional basis until I decide whether
    it's actually okay or whether we need to fix some stuff before it goes
    in.

 meld/sourceview.py |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/meld/sourceview.py b/meld/sourceview.py
index 1cf6cd1..1f69c5b 100644
--- a/meld/sourceview.py
+++ b/meld/sourceview.py
@@ -145,7 +145,9 @@ class MeldSourceView(GtkSource.View):
         self._show_line_numbers = None
 
         buf = MeldBuffer()
-        buf.create_tag("inline")
+        inline_tag = GtkSource.Tag.new("inline")
+        inline_tag.props.draw_spaces = True
+        buf.get_tag_table().add(inline_tag)
         buf.create_tag("dimmed")
         self.set_buffer(buf)