if the capture selector matches multiple elements, make sure all of the...

if the capture selector matches multiple elements, make sure all of the elements will be captured and visible in the screenshot

UI @ 0af99d92

-Subproject commit 38cc1225c722d9a722221d2fc7796a6b81206351
+Subproject commit 0af99d928e2dc3c7dd5d6e4de865d0d89d037498

tests/lib/screenshot-testing/support/page-renderer.js

@@ -237,7 +237,29 @@ PageRenderer.prototype.capture = function (outputPath, callback, selector) {
             var element = window.jQuery(selector);
 
             if (element && element.length) {
-                return element[0].getBoundingClientRect();
+                var clipRect = {bottom: null, height: null, left: null, right: null, top: null, width: null};
+
+                element.each(function (index, node) {
+                    var rect = node.getBoundingClientRect();
+
+                    if (null === clipRect.left || rect.left < clipRect.left) {
+                        clipRect.left = rect.left;
+                    }
+                    if (null === clipRect.top || rect.top < clipRect.top) {
+                        clipRect.top = rect.top;
+                    }
+                    if (null === clipRect.right || rect.right > clipRect.right) {
+                        clipRect.right = rect.right;
+                    }
+                    if (null === clipRect.bottom || rect.bottom > clipRect.bottom) {
+                        clipRect.bottom = rect.bottom;
+                    }
+                });
+
+                clipRect.width  = clipRect.right - clipRect.left;
+                clipRect.height = clipRect.bottom - clipRect.top;
+
+                return clipRect;
             }
 
         }, selector);