[gnome-calculator] Fixed black rectangle on entry scrolling (bgo#793157)

[Robert Roth <robertroth src gnome org>]

commit 9de5ce309d8c3ac2c68654eb1433e4d00fbd226c
Author: Robert Roth <robert roth off gmail com>
Date:   Sun Feb 4 09:47:01 2018 +0200

    Fixed black rectangle on entry scrolling (bgo#793157)

 src/calculator.css    |    3 +--
 src/history-view.ui   |    1 -
 src/math-display.vala |    1 +
 3 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/calculator.css b/src/calculator.css
index 2b0d4a9..4b86070 100644
--- a/src/calculator.css
+++ b/src/calculator.css
@@ -52,8 +52,7 @@ window > grid {
 }
 
 .sourceview {
-  padding-left: 12px;
-  margin-left: 10px;
+  padding-left: 0px;
   font-size: 1.4em;
 }
 
diff --git a/src/history-view.ui b/src/history-view.ui
index c7f0d63..1b77119 100644
--- a/src/history-view.ui
+++ b/src/history-view.ui
@@ -22,7 +22,6 @@
             <property name="can_focus">False</property>
             <property name="vexpand">True</property>
             <property name="valign">end</property>
-            <property name="border_width">5</property>
             <property name="selection_mode">none</property>
           </object>
         </child>
diff --git a/src/math-display.vala b/src/math-display.vala
index fbbe113..69ae0bf 100644
--- a/src/math-display.vala
+++ b/src/math-display.vala
@@ -44,6 +44,7 @@ public class MathDisplay : Gtk.Viewport
         scrolled_window.set_policy (Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.NEVER);
         source_view = new Gtk.SourceView.with_buffer (equation);
         source_view.set_accepts_tab (false);
+        source_view.set_left_margin (14);
         source_view.set_pixels_above_lines (8);
         source_view.set_pixels_below_lines (2);
         source_view.set_justification (Gtk.Justification.LEFT);