From 5cec207d5a3a991601a313d7d3f2e81061d23bb4 Mon Sep 17 00:00:00 2001
From: Phil Crosby
Date: Sun, 6 Dec 2009 15:52:52 -0800
Subject: Use both the upper-left corner and the center of a link's bounding
 box to determine if it's visible.

I previously switched the logic to use the center of the bounding box, but that does
not work well for multi-line links.
---
 linkHints.js | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/linkHints.js b/linkHints.js
index 92e4a7e4..178efedb 100644
--- a/linkHints.js
+++ b/linkHints.js
@@ -84,13 +84,17 @@ function getVisibleClickableElements() {
       continue;
 
     // Using getElementFromPoint will omit elements which have visibility=hidden or display=none, and
-    // elements inside of containers that are also hidden. Check for whether the element occupies the center
-    // of its bounding box instead of simply the upper-left corner of that box because this is more accurate
-    // when inline links have vertical padding, like in the links ("Source", "Commits") at the top of github.com.
+    // elements inside of containers that are also hidden. We're checking for whether the element occupies
+    // the upper left corner and if that fails, we also check whether the element occupies the center of the
+    // box. We use the center of the box because it's more accurate when inline links have vertical padding,
+    // like in the links ("Source", "Commits") at the top of github.com.
     // This will not exclude links with "opacity=0", like the links on Google's homepage (see bug #16).
-    if (!elementOccupiesPoint(element, boundingRect.left + boundingRect.width / 2,
-          boundingRect.top + boundingRect.height / 2))
-      continue;
+    if (!elementOccupiesPoint(element, boundingRect.left, boundingRect.top)) {
+      var elementOccupiesCenter = elementOccupiesPoint(element, boundingRect.left + boundingRect.width / 2,
+          boundingRect.top + boundingRect.height / 2);
+      if (!elementOccupiesCenter)
+        continue;
+    }
 
     visibleElements.push(element);
   }
-- 
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