Keep ime information up-to-date even when divider invisible

Otherwise, it can accidentally put the divider into ime
mode when there isn't an ime.

Bug: 159380790
Test: with minimized primary, open ime in launcher then expand
      primary to leave split mode. Re-enter min primary and
      rotate device. Open an app in secondary and make sure
      it doesn't dim the primary.
Change-Id: I68a9b56073b247e0a63c6670a9e1b330014bebc8

packages/SystemUI/src/com/android/systemui/stackdivider/DividerImeController.java

@@ -126,16 +126,16 @@ class DividerImeController implements DisplayImeController.ImePositionProcessor
     @Override
     public void onImeStartPositioning(int displayId, int hiddenTop, int shownTop,
             boolean imeShouldShow, SurfaceControl.Transaction t) {
+        mHiddenTop = hiddenTop;
+        mShownTop = shownTop;
+        mTargetShown = imeShouldShow;
         if (!isDividerVisible()) {
             return;
         }
         final boolean splitIsVisible = !getView().isHidden();
         mSecondaryHasFocus = getSecondaryHasFocus(displayId);
         final boolean targetAdjusted = splitIsVisible && imeShouldShow && mSecondaryHasFocus
-                && !getLayout().mDisplayLayout.isLandscape();
-        mHiddenTop = hiddenTop;
-        mShownTop = shownTop;
-        mTargetShown = imeShouldShow;
+                && !getLayout().mDisplayLayout.isLandscape() && !mSplits.mDivider.isMinimized();
         if (mLastAdjustTop < 0) {
             mLastAdjustTop = imeShouldShow ? hiddenTop : shownTop;
         } else if (mLastAdjustTop != (imeShouldShow ? mShownTop : mHiddenTop)) {