Implement expandable candidates pane

<?xml version="1.0" encoding="utf-8"?>

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<merge

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"

>

    <include

        android:id="@+id/candidate_left"

        layout="@layout/candidate" />

    <include

        layout="@layout/candidate_divider" />

    <include

        android:id="@+id/candidate_center"

        layout="@layout/candidate" />

    <include

        layout="@layout/candidate_divider" />

    <LinearLayout

        android:orientation="horizontal"

        android:layout_weight="1.0"

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:gravity="center_vertical"

    >

        <include

            android:id="@+id/candidate_right"

            layout="@layout/candidate" />

        <!-- TODO: These images' drawable must be determined depending on theme. -->

        <ImageButton

            android:id="@+id/expand_candidates_pane"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:src="@drawable/btn_expand_candidates_pane"

            android:visibility="gone"

            style="?attr/suggestionBackgroundStyle" />

        <ImageButton

            android:id="@+id/close_candidates_pane"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:src="@drawable/btn_close_candidates_pane"

            android:visibility="gone"

            style="?attr/suggestionBackgroundStyle" />

    </LinearLayout>

</merge>