[gnome-shell] boxpointer: Use the right source center for the arrow pointing

[Dan Winship <danw src gnome org>]

commit c705b64d6747fdb95a66617e9f6f9eaaf706ecee
Author: Sardem FF7 <sardemff7 pub gmail com>
Date:   Wed Feb 2 23:38:55 2011 +0100

    boxpointer: Use the right source center for the arrow pointing
    
    Point the arrow to the center of the sourceActor's content box, rather
    than its allocation, in case it has asymmetric padding (as the
    rightmost message tray summary item does).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=641728

 js/ui/boxpointer.js    |    5 ++++-
 src/st/st-theme-node.c |    2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/boxpointer.js b/js/ui/boxpointer.js
index ecdfeb5..206221b 100644
--- a/js/ui/boxpointer.js
+++ b/js/ui/boxpointer.js
@@ -309,9 +309,12 @@ BoxPointer.prototype = {
         this.actor.show();
 
         // Position correctly relative to the sourceActor
+        let sourceNode = sourceActor.get_theme_node();
+        let sourceContentBox = sourceNode.get_content_box(sourceActor.get_allocation_box());
         let [sourceX, sourceY] = sourceActor.get_transformed_position();
         let [sourceWidth, sourceHeight] = sourceActor.get_transformed_size();
-        let [sourceCenterX, sourceCenterY] = [sourceX + (sourceWidth / 2), sourceY + (sourceHeight / 2)];
+        let sourceCenterX = sourceX + sourceContentBox.x1 + (sourceContentBox.x2 - sourceContentBox.x1) / 2;
+        let sourceCenterY = sourceY + sourceContentBox.y1 + (sourceContentBox.y2 - sourceContentBox.y1) / 2;
         let [minWidth, minHeight, natWidth, natHeight] = this.actor.get_preferred_size();
 
         // We also want to keep it onscreen, and separated from the
diff --git a/src/st/st-theme-node.c b/src/st/st-theme-node.c
index 6fb579f..140d5d1 100644
--- a/src/st/st-theme-node.c
+++ b/src/st/st-theme-node.c
@@ -3184,7 +3184,7 @@ st_theme_node_adjust_preferred_height (StThemeNode  *node,
  * st_theme_node_get_content_box:
  * @node: a #StThemeNode
  * @allocation: the box allocated to a #ClutterAlctor
- * @content_box: computed box occupied by the actor's content
+ * @content_box: (out): computed box occupied by the actor's content
  *
  * Gets the box within an actor's allocation that contents the content
  * of an actor (excluding borders and padding). This is a convenience function