Make synopsis frame behave properly in Firefox.

In Firefox, pressing the back button first reverted the synopsis
frame, and only clicking the back button a second time would update
the main frame.

1 files changed, 6 insertions, 1 deletions

diff --git a/html/haddock-util.js b/html/haddock-util.js
index 5978f056..4a7e4255 100644
--- a/html/haddock-util.js
+++ b/html/haddock-util.js
@@ -198,7 +198,12 @@ function perform_search(full)
 
 function setSynopsis(filename) {
     if (parent.window.synopsis) {
-      parent.window.synopsis.location = filename;
+        if (parent.window.synopsis.location.replace) {
+            // In Firefox this avoids adding the change to the history.
+            parent.window.synopsis.location.replace(filename);
+        } else {
+            parent.window.synopsis.location = filename;
+        }
     }
 }