Minor Copy/Paste overlay UI edits

- update background color of text view to match buttons
- add padding to right edge of edit text activity TextView
- add ellipsis when text is cut off in preview

Bug: 223845368
Fix: 223845368
Bug: 223965587
Fix: 223965587
Bug: 223829956
Fix: 223829956
Test: manual (visual changes; tested in light and dark modes)
Change-Id: Ibcb276c34e402687a7954887d0574e60501d178b

packages/SystemUI/res/layout/clipboard_edit_text_activity.xml

@@ -43,10 +43,10 @@
         android:layout_height="0dp"
         android:layout_marginTop="8dp"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintStart_toStartOf="@+id/copy_button"
+        app:layout_constraintEnd_toEndOf="@id/share"
         app:layout_constraintTop_toBottomOf="@+id/attribution">
 
         <EditText

packages/SystemUI/res/layout/clipboard_overlay.xml

@@ -16,6 +16,7 @@
   -->
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:alpha="0"
     android:layout_width="match_parent"
@@ -118,7 +119,8 @@
                       android:autoSizeTextType="uniform"
                       android:autoSizeMinTextSize="10sp"
                       android:autoSizeMaxTextSize="200sp"
-                      android:textColor="?android:attr/textColorPrimary"
+                      android:textColor="?attr/overlayButtonTextColor"
+                      android:background="?androidprv:attr/colorAccentSecondary"
                       android:layout_width="@dimen/clipboard_preview_size"
                       android:layout_height="@dimen/clipboard_preview_size"/>
             <ImageView

packages/SystemUI/src/com/android/systemui/clipboardoverlay/ClipboardOverlayController.java

@@ -190,6 +190,13 @@ public class ClipboardOverlayController {
             }
         });
 
+        mTextPreview.getViewTreeObserver().addOnPreDrawListener(() -> {
+            int availableHeight = mTextPreview.getHeight()
+                    - (mTextPreview.getPaddingTop() + mTextPreview.getPaddingBottom());
+            mTextPreview.setMaxLines(availableHeight / mTextPreview.getLineHeight());
+            return true;
+        });
+
         mDismissButton.setOnClickListener(view -> animateOut());
 
         mEditChip.setIcon(Icon.createWithResource(mContext, R.drawable.ic_screenshot_edit), true);