Improve keyboard height adjustment trigger mechanism

Previous approach was hideSoftInputFromWindow + showSoftInput.
This approach was bad because:
1. It caused a flash due to the keyboard being hidden then reshown.
2. It failed to actually redraw at the new size in Android 16 (API 36),
   presumably due to changes in the heuristics used to determine whether
   a redraw is actually required.
---
New approach is restartInput + showSoftInput.
This seems to fix both problems:
1. The flash no longer occurs.
2. The keyboard is properly redrawn at the new size in Android 16 (API 36).
---
Fixes <#21>.

Author: yawnoc

CHANGELOG.md

@@ -3,6 +3,8 @@
 
 ## [Unreleased]
 
+- Fixed keyboard height not immediately updating in Android 16
+
 
 ## [v1.4.3] (69) Cursed be Android 16 (2025-06-29)
 

app/src/main/java/io/github/yawnoc/strokeinput/MainActivity.java

@@ -93,13 +93,13 @@ public void onStartTrackingTouch(SeekBar seekBar)
         @Override
         public void onStopTrackingTouch(SeekBar seekBar)
         {
-          // Hide and reshow keyboard to trigger height readjustment
+          // Trigger height readjustment and ensure keyboard shown
           final View focusView = getCurrentFocus();
           if (focusView != null)
           {
             final InputMethodManager inputMethodManager =
                     (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
-            inputMethodManager.hideSoftInputFromWindow(focusView.getWindowToken(), 0);
+            inputMethodManager.restartInput(focusView);
             inputMethodManager.showSoftInput(findViewById(R.id.test_input), InputMethodManager.SHOW_IMPLICIT);
           }
         }