When app overlay (CtS or Gemini) is involved, overlay is the
firstAppTarget and the actual lowest layer is another target in apps
Instead of blurring behind the lowest firstAppTarget, find the lowest
among all apps targets between all RemoteTargetHandles. This is
determined using layer id.
Fix: 422111861
Test: Launch any app, Long press power button to start Gemini, Swipe up
Flag: com.android.launcher3.enable_overview_background_wallpaper_blur
Change-Id: I46aa3f642ec3446221ee31d0cf8242970bece9b2
Vinay Joglekar
c03dd96a10