app-misc/piper: add ebuild and patches

app-misc/piper/files/piper-0.2.900-mousemap-redraw-on-allocate.patch

@@ -0,0 +1,34 @@
+From e35fda4f884efa1237b6729395a99ea85cc7872f Mon Sep 17 00:00:00 2001
+From: Jente Hidskes <hjdskes@gmail.com>
+Date: Mon, 28 Aug 2017 12:41:09 +0200
+Subject: [PATCH 03/30] MouseMap: redraw on allocate
+
+In a previous commit I added this optimization that prevents redrawing
+the widget when it is reallocated: with the widget being centered,
+enlarging the window does not require to redraw the widget.
+
+However, I missed the case where the allocation actually gets smaller
+(and thus the SVG is repositioned) when the width of one of the child
+widgets changes, which would with this optimization result in parts of
+the SVG being shifted a few pixels to the left with the remainder being
+in its original position. Hence, this fixes a visual glitch in drawing
+the SVG.
+---
+ piper/mousemap.py | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/piper/mousemap.py b/piper/mousemap.py
+index 7b122ba..0d8fbb5 100644
+--- a/piper/mousemap.py
++++ b/piper/mousemap.py
+@@ -112,7 +112,6 @@ class MouseMap(Gtk.Container):
+ 
+         Gtk.Container.__init__(self, *args, **kwargs)
+         self.set_has_window(False)
+-        self.set_redraw_on_allocate(False)
+ 
+         self.spacing = spacing
+         self._layer = layer
+-- 
+2.16.1
+