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-rw-r--r--layout/generic/nsGfxScrollFrame.cpp11
-rw-r--r--layout/generic/nsGfxScrollFrame.h3
2 files changed, 12 insertions, 2 deletions
diff --git a/layout/generic/nsGfxScrollFrame.cpp b/layout/generic/nsGfxScrollFrame.cpp
index cfa366aa3..3ed3b0bb3 100644
--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -2152,8 +2152,7 @@ void
ScrollFrameHelper::CompleteAsyncScroll(const nsRect &aRange, nsIAtom* aOrigin)
{
// Apply desired destination range since this is the last step of scrolling.
- mAsyncSmoothMSDScroll = nullptr;
- mAsyncScroll = nullptr;
+ RemoveObservers();
nsWeakFrame weakFrame(mOuter);
ScrollToImpl(mDestination, aRange, aOrigin);
if (!weakFrame.IsAlive()) {
@@ -4588,11 +4587,19 @@ ScrollFrameHelper::Destroy()
mScrollActivityTimer->Cancel();
mScrollActivityTimer = nullptr;
}
+ RemoveObservers();
+}
+
+void
+ScrollFrameHelper::RemoveObservers()
+{
if (mAsyncScroll) {
mAsyncScroll->RemoveObserver();
+ mAsyncScroll = nullptr;
}
if (mAsyncSmoothMSDScroll) {
mAsyncSmoothMSDScroll->RemoveObserver();
+ mAsyncSmoothMSDScroll = nullptr;
}
}
diff --git a/layout/generic/nsGfxScrollFrame.h b/layout/generic/nsGfxScrollFrame.h
index f1ef44ae8..81bbb358f 100644
--- a/layout/generic/nsGfxScrollFrame.h
+++ b/layout/generic/nsGfxScrollFrame.h
@@ -638,6 +638,9 @@ protected:
bool HasBgAttachmentLocal() const;
uint8_t GetScrolledFrameDir() const;
+ // Removes any RefreshDriver observers we might have registered.
+ void RemoveObservers();
+
static void EnsureFrameVisPrefsCached();
static bool sFrameVisPrefsCached;
// The number of scrollports wide/high to expand when tracking frame visibility.