Revert "Revert "Allow transient taskbar to unstash over soft ime""

This reverts commit c8c81a3425.

Reason for revert: fix tests by not auto stashing when ime comes up, but still allow taskbar to show if user initiaties it

Bug: 255818649
Change-Id: Id3ab27dcc205e5a72dbd0481e3eabc10b2e1b643
Test: pull up ime, swipe to reveal taskbar

quickstep/src/com/android/launcher3/taskbar/TaskbarStashController.java

@@ -758,8 +758,12 @@ public class TaskbarStashController implements TaskbarControllers.LoggableTaskba
      *  * in small screen AND
      *  * 3 button nav AND
      *  * landscape (or seascape)
+     * We do not stash if taskbar is transient
      */
     private boolean shouldStashForIme() {
+        if (DisplayController.isTransientTaskbar(mActivity)) {
+            return false;
+        }
         return (mIsImeShowing || mIsImeSwitcherShowing) &&
                 !(isPhoneMode() && mActivity.isThreeButtonNav()
                         && mActivity.getDeviceProfile().isLandscape);