Program: 83838
Project: 83838
Buggy source:
@Override public boolean onKeyDown(int keyCode,KeyEvent event){
  if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) {
    if (mArrowNavigation) {
      int whichApp=mRollo.mState.selectedIconIndex;
      if (whichApp >= 0) {
        ApplicationInfo app=mAllAppsList.get(whichApp);
        mLauncher.startActivitySafely(app.intent);
      }
    }
  }
  if (mArrowNavigation && mRollo.mState.iconCount > 0) {
    mArrowNavigation=true;
    int currentSelection=mRollo.mState.selectedIconIndex;
    int currentTopRow=(int)mRollo.mMessageProc.mPosX;
    int currentPageCol=currentSelection % Defines.COLUMNS_PER_PAGE;
    int currentPageRow=(currentSelection - (currentTopRow * Defines.COLUMNS_PER_PAGE)) / Defines.ROWS_PER_PAGE;
    int newSelection=currentSelection;
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_UP:
      if (currentPageRow > 0) {
        newSelection=currentSelection - Defines.COLUMNS_PER_PAGE;
      }
 else       if (currentTopRow > 0) {
        mRollo.moveTo(currentTopRow - 1);
        newSelection=currentSelection - Defines.COLUMNS_PER_PAGE;
      }
    break;
case KeyEvent.KEYCODE_DPAD_DOWN:
  if (currentSelection < mRollo.mState.iconCount - Defines.COLUMNS_PER_PAGE) {
    if (currentPageRow < Defines.ROWS_PER_PAGE - 1) {
      newSelection=currentSelection + Defines.COLUMNS_PER_PAGE;
    }
 else {
      mRollo.moveTo(currentTopRow + 1);
      newSelection=currentSelection + Defines.COLUMNS_PER_PAGE;
    }
  }
break;
case KeyEvent.KEYCODE_DPAD_LEFT:
if (currentPageCol > 0) {
newSelection=currentSelection - 1;
}
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
if ((currentPageCol < Defines.COLUMNS_PER_PAGE - 1) && (currentSelection < mRollo.mState.iconCount - 1)) {
newSelection=currentSelection + 1;
}
break;
}
if (newSelection != currentSelection) {
mRollo.selectIcon(newSelection);
mRollo.mState.save();
}
}
return true;
}

Fixed version (ground truth):
@Override public boolean onKeyDown(int keyCode,KeyEvent event){
  if (!isVisible()) {
    return false;
  }
  if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) {
    if (mArrowNavigation) {
      int whichApp=mRollo.mState.selectedIconIndex;
      if (whichApp >= 0) {
        ApplicationInfo app=mAllAppsList.get(whichApp);
        mLauncher.startActivitySafely(app.intent);
      }
    }
  }
  if (mArrowNavigation && mRollo.mState.iconCount > 0) {
    mArrowNavigation=true;
    int currentSelection=mRollo.mState.selectedIconIndex;
    int currentTopRow=(int)mRollo.mMessageProc.mPosX;
    int currentPageCol=currentSelection % Defines.COLUMNS_PER_PAGE;
    int currentPageRow=(currentSelection - (currentTopRow * Defines.COLUMNS_PER_PAGE)) / Defines.ROWS_PER_PAGE;
    int newSelection=currentSelection;
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_UP:
      if (currentPageRow > 0) {
        newSelection=currentSelection - Defines.COLUMNS_PER_PAGE;
      }
 else       if (currentTopRow > 0) {
        mRollo.moveTo(currentTopRow - 1);
        newSelection=currentSelection - Defines.COLUMNS_PER_PAGE;
      }
    break;
case KeyEvent.KEYCODE_DPAD_DOWN:
  if (currentSelection < mRollo.mState.iconCount - Defines.COLUMNS_PER_PAGE) {
    if (currentPageRow < Defines.ROWS_PER_PAGE - 1) {
      newSelection=currentSelection + Defines.COLUMNS_PER_PAGE;
    }
 else {
      mRollo.moveTo(currentTopRow + 1);
      newSelection=currentSelection + Defines.COLUMNS_PER_PAGE;
    }
  }
break;
case KeyEvent.KEYCODE_DPAD_LEFT:
if (currentPageCol > 0) {
newSelection=currentSelection - 1;
}
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
if ((currentPageCol < Defines.COLUMNS_PER_PAGE - 1) && (currentSelection < mRollo.mState.iconCount - 1)) {
newSelection=currentSelection + 1;
}
break;
}
if (newSelection != currentSelection) {
mRollo.selectIcon(newSelection);
mRollo.mState.save();
}
}
return true;
}