Close IME on Taskbar drag.

Matches LauncherDragController#startDrag impl.

Test: Manual
Fix: 299167809
Flag: No
Change-Id: If6552b0c9cf7bfcdd01f1802eaf895bde4f357d8
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
index 3c7196a..4ad5c88 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
@@ -259,6 +259,8 @@
             DraggableView originalView, int dragLayerX, int dragLayerY, DragSource source,
             ItemInfo dragInfo, Rect dragRegion, float initialDragViewScale,
             float dragViewScaleOnDrop, DragOptions options) {
+        mActivity.hideKeyboard();
+
         mOptions = options;
 
         mRegistrationX = mMotionDown.x - dragLayerX;