DisplayImeController: reapply visibility when leash changes

Fixes an issue where the DisplayImeController did not re-apply the visibility
if it receives a new leash.

This lead to focusable IME dialogs not being visible sometimes upon relaunching
the IME target activity, such as during rotation.

Fixes: 162875596
Bug: 160672060
Test: Enable Braille keyboard, open Settings, click on search box, switch to Braille keyboard, on the confirmation dialog rotate the screen; verify the dialog does not disappear.
Change-Id: Ia40a682ca8a9ba669454892e2b453f736c55929c
Merged-In: Ia40a682ca8a9ba669454892e2b453f736c55929c

packages/SystemUI/src/com/android/systemui/wm/DisplayImeController.java

@@ -228,12 +228,22 @@ public class DisplayImeController implements DisplayController.OnDisplaysChanged
                         mHandler.post(() -> {
                             final Point lastSurfacePosition = mImeSourceControl != null
                                     ? mImeSourceControl.getSurfacePosition() : null;
+                            final boolean positionChanged =
+                                    !activeControl.getSurfacePosition().equals(lastSurfacePosition);
+                            final boolean leashChanged =
+                                    !haveSameLeash(mImeSourceControl, activeControl);
                             mImeSourceControl = activeControl;
-                            if (!activeControl.getSurfacePosition().equals(lastSurfacePosition)
-                                    && mAnimation != null) {
-                                startAnimation(mImeShowing, true /* forceRestart */);
-                            } else if (!mImeShowing) {
-                                removeImeSurface();
+                            if (mAnimation != null) {
+                                if (positionChanged) {
+                                    startAnimation(mImeShowing, true /* forceRestart */);
+                                }
+                            } else {
+                                if (leashChanged) {
+                                    applyVisibilityToLeash();
+                                }
+                                if (!mImeShowing) {
+                                    removeImeSurface();
+                                }
                             }
                         });
                     }
@@ -241,6 +251,20 @@ public class DisplayImeController implements DisplayController.OnDisplaysChanged
             }
         }
 
+        private void applyVisibilityToLeash() {
+            SurfaceControl leash = mImeSourceControl.getLeash();
+            if (leash != null) {
+                SurfaceControl.Transaction t = mTransactionPool.acquire();
+                if (mImeShowing) {
+                    t.show(leash);
+                } else {
+                    t.hide(leash);
+                }
+                t.apply();
+                mTransactionPool.release(t);
+            }
+        }
+
         @Override
         public void showInsets(int types, boolean fromIme) {
             if ((types & WindowInsets.Type.ime()) == 0) {
@@ -492,4 +516,20 @@ public class DisplayImeController implements DisplayController.OnDisplaysChanged
         return IInputMethodManager.Stub.asInterface(
                 ServiceManager.getService(Context.INPUT_METHOD_SERVICE));
     }
+
+    private static boolean haveSameLeash(InsetsSourceControl a, InsetsSourceControl b) {
+        if (a == b) {
+            return true;
+        }
+        if (a == null || b == null) {
+            return false;
+        }
+        if (a.getLeash() == b.getLeash()) {
+            return true;
+        }
+        if (a.getLeash() == null || b.getLeash() == null) {
+            return false;
+        }
+        return a.getLeash().isSameSurface(b.getLeash());
+    }
 }

services/core/java/com/android/server/wm/WindowManagerService.java

@@ -6187,7 +6187,7 @@ public class WindowManagerService extends IWindowManager.Stub
             }
             if (inputMethodControlTarget != null) {
                 pw.print("  inputMethodControlTarget in display# "); pw.print(displayId);
-                pw.print(' '); pw.println(inputMethodControlTarget.getWindow());
+                pw.print(' '); pw.println(inputMethodControlTarget);
             }
         });
         pw.print("  mInTouchMode="); pw.println(mInTouchMode);