The following layout tests are failing on GTK after r194502: fast/dom/horizontal-scrollbar-when-dir-change.html failed unexpectedly (text diff) fast/dom/horizontal-scrollbar-in-rtl.html failed unexpectedly (text diff) fast/dom/scroll-reveal-top-overflow.html failed unexpectedly (text diff) fast/dom/scroll-reveal-left-overflow.html failed unexpectedly (text diff) fast/dom/vertical-scrollbar-when-dir-change.html failed unexpectedly (text diff) fast/dom/rtl-scroll-to-leftmost-and-resize.html failed unexpectedly (text diff)
After the changes in r194513 landed as fix for bug #152649 only the following test is failing: fast/dom/horizontal-scrollbar-in-rtl.html failed unexpectedly (text diff)
This suggests that GTK has some scrollOffset/scrollPosition confusion.