Fix clipping for popups.

This appears to be a behavior change in newer API levels. PopupWindow's
setClippingEnabled has been around since API level 3, but appears to
have been optional.

See also:
https://stackoverflow.com/questions/46564984/android-custom-keyboard-preview-view-constrained-to-parent-layout

app/src/main/java/org/pocketworkstation/pckeyboard/CandidateView.java

@@ -108,6 +108,7 @@ public CandidateView(Context context, AttributeSet attrs) {
         mPreviewPopup.setContentView(mPreviewText);
         mPreviewPopup.setBackgroundDrawable(null);
         mPreviewPopup.setAnimationStyle(R.style.KeyPreviewAnimation);
+        mPreviewPopup.setClippingEnabled(false);
         mColorNormal = res.getColor(R.color.candidate_normal);
         mColorRecommended = res.getColor(R.color.candidate_recommended);
         mColorOther = res.getColor(R.color.candidate_other);

app/src/main/java/org/pocketworkstation/pckeyboard/LatinKeyboardView.java

@@ -163,6 +163,7 @@ public LatinKeyboardView(Context context, AttributeSet attrs, int defStyle) {
             mPreviewPopup.setBackgroundDrawable(null);
             mPreviewPopup.setTouchable(false);
             mPreviewPopup.setAnimationStyle(R.style.KeyPreviewAnimation);
+            mPreviewPopup.setClippingEnabled(false);
         } else {
             mShowPreview = false;
         }
@@ -175,8 +176,8 @@ public LatinKeyboardView(Context context, AttributeSet attrs, int defStyle) {
             mMiniKeyboardPopup.setBackgroundDrawable(null);
             mMiniKeyboardPopup.setAnimationStyle(R.style.MiniKeyboardAnimation);
             mMiniKeyboardVisible = false;
+            mMiniKeyboardPopup.setClippingEnabled(false);
         }
-
     }
 
     public void setPhoneKeyboard(Keyboard phoneKeyboard) {