Fix double delete on backspace on Android (#22626)

shell/platform/android/io/flutter/plugin/editing/InputConnectionAdaptor.java

@@ -296,21 +296,7 @@ class InputConnectionAdaptor extends BaseInputConnection
     }
 
     if (event.getAction() == KeyEvent.ACTION_DOWN) {
-      if (event.getKeyCode() == KeyEvent.KEYCODE_DEL) {
-        int selStart = clampIndexToEditable(Selection.getSelectionStart(mEditable), mEditable);
-        int selEnd = clampIndexToEditable(Selection.getSelectionEnd(mEditable), mEditable);
-        if (selStart == selEnd && selStart > 0) {
-          // Extend selection to left of the last character
-          selStart = flutterTextUtils.getOffsetBefore(mEditable, selStart);
-        }
-        if (selEnd > selStart) {
-          // Delete the selection.
-          Selection.setSelection(mEditable, selStart);
-          mEditable.delete(selStart, selEnd);
-          return true;
-        }
-        return false;
-      } else if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
+      if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
         int selStart = Selection.getSelectionStart(mEditable);
         int selEnd = Selection.getSelectionEnd(mEditable);
         if (selStart == selEnd && !event.isShiftPressed()) {

shell/platform/android/test/io/flutter/plugin/editing/InputConnectionAdaptorTest.java

@@ -1029,166 +1029,18 @@ public class InputConnectionAdaptorTest {
   }
 
   @Test
-  public void testSendKeyEvent_delKeyDeletesBackward() {
+  public void testSendKeyEvent_delKeyNotConsumed() {
     int selStart = 29;
     ListenableEditingState editable = sampleEditable(selStart, selStart, SAMPLE_RTL_TEXT);
     InputConnectionAdaptor adaptor = sampleInputConnectionAdaptor(editable);
 
     KeyEvent downKeyDown = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL);
 
-    for (int i = 0; i < 9; i++) {
+    for (int i = 0; i < 10; i++) {
       boolean didConsume = adaptor.sendKeyEvent(downKeyDown);
-      assertTrue(didConsume);
-    }
-    assertEquals(Selection.getSelectionStart(editable), 19);
-
-    for (int i = 0; i < 9; i++) {
-      boolean didConsume = adaptor.sendKeyEvent(downKeyDown);
-      assertTrue(didConsume);
-    }
-    assertEquals(Selection.getSelectionStart(editable), 10);
-  }
-
-  @Test
-  public void testSendKeyEvent_delKeyDeletesBackwardComplexEmojis() {
-    int selStart = 75;
-    ListenableEditingState editable = sampleEditable(selStart, selStart, SAMPLE_EMOJI_TEXT);
-    InputConnectionAdaptor adaptor = sampleInputConnectionAdaptor(editable);
-
-    KeyEvent downKeyDown = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL);
-    boolean didConsume;
-
-    // Normal Character
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 74);
-
-    // Non-Spacing Mark
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 73);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 72);
-
-    // Keycap
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 69);
-
-    // Keycap with invalid base
-    adaptor.setSelection(68, 68);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 66);
-    adaptor.setSelection(67, 67);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 66);
-
-    // Zero Width Joiner
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 55);
-
-    // Zero Width Joiner with invalid base
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 53);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 52);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 51);
-
-    // ----- Start Emoji Tag Sequence with invalid base testing ----
-    // Delete base tag
-    adaptor.setSelection(39, 39);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 37);
-
-    // Delete the sequence
-    adaptor.setSelection(49, 49);
-    for (int i = 0; i < 6; i++) {
-      didConsume = adaptor.sendKeyEvent(downKeyDown);
-      assertTrue(didConsume);
+      assertFalse(didConsume);
     }
-    assertEquals(Selection.getSelectionStart(editable), 37);
-    // ----- End Emoji Tag Sequence with invalid base testing ----
-
-    // Emoji Tag Sequence
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 23);
-
-    // Variation Selector with invalid base
-    adaptor.setSelection(22, 22);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 21);
-    adaptor.setSelection(22, 22);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 21);
-
-    // Variation Selector
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 19);
-
-    // Emoji Modifier
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 16);
-
-    // Emoji Modifier with invalid base
-    adaptor.setSelection(14, 14);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 13);
-    adaptor.setSelection(14, 14);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 13);
-
-    // Line Feed
-    adaptor.setSelection(12, 12);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 11);
-
-    // Carriage Return
-    adaptor.setSelection(12, 12);
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 11);
-
-    // Carriage Return and Line Feed
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 9);
-
-    // Regional Indicator Symbol odd
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 7);
-
-    // Regional Indicator Symbol even
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 3);
-
-    // Simple Emoji
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 1);
-
-    // First CodePoint
-    didConsume = adaptor.sendKeyEvent(downKeyDown);
-    assertTrue(didConsume);
-    assertEquals(Selection.getSelectionStart(editable), 0);
+    assertEquals(29, Selection.getSelectionStart(editable));
   }
 
   @Test