compute Y scroll max by scaling only, ignoring title bar height
compute Y scroll max by scaling only, ignoring title bar height

without this, the max scroll may be a single pixel

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base