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c779ae54ce
This patch fixes the following user flow: 1) App is already running 2) User initiates splitscreen from Home with that app 3) User selects the same app from Taskbar or AllApps Previously, this caused a crash because the split-from-home initiation removed the corresponding app tile, causing a null pointer exception when the same task ID was used as a split target. Fixed by adding a null check: if the target TaskView can't be found for any reason, fall back to launching the second app via Intent instead. If the app doesn't support multi-instance, the UI will now show an attempted split, followed by the message "This app can only be opened in 1 window." Fixes: 263041522 Fixes: 266218404 Test: Manual Change-Id: I39ed60c9ac758ac215391f0618f44f7fcee4f32c