ComposeActivity: put buttons into relativelayout and scrollview so they would not push send button outside of screen

app/src/main/res/layout/activity_compose.xml

@@ -295,7 +295,7 @@
         app:behavior_peekHeight="0dp"
         app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior" />
 
-    <LinearLayout
+    <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_gravity="bottom"
@@ -308,6 +308,18 @@
         android:paddingEnd="8dp"
         android:paddingBottom="4dp">
 
+        <HorizontalScrollView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_alignParentLeft="true"
+            android:layout_centerVertical="true"
+            android:layout_toLeftOf="@+id/composeCharactersLeftView"
+            android:requiresFadingEdge="horizontal">
+            
+            <LinearLayout
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content">
+
                 <ImageButton
                     android:id="@+id/composeAddMediaButton"
                     style="@style/TuskyImageButton"
@@ -385,11 +397,8 @@
                     android:tooltipText="@string/action_markdown"
                     android:visibility="gone"
                     app:srcCompat="@drawable/ic_markdown" />
-
+            </LinearLayout>
-        <Space
+        </HorizontalScrollView>
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1" />
 
         <TextView
             android:id="@+id/composeCharactersLeftView"
@@ -397,6 +406,8 @@
             android:layout_height="wrap_content"
             android:textColor="?android:textColorTertiary"
             android:textSize="?attr/status_text_medium"
+            android:layout_toLeftOf="@+id/composeTootButton"
+            android:layout_centerVertical="true"
             tools:text="500" />
 
         <com.keylesspalace.tusky.components.compose.view.TootButton
@@ -405,8 +416,10 @@
             android:layout_width="@dimen/toot_button_width"
             android:layout_height="wrap_content"
             android:layout_marginStart="10dp"
-            android:textSize="?attr/status_text_medium" />
+            android:textSize="?attr/status_text_medium"
+            android:layout_alignParentRight="true"
+            android:layout_centerVertical="true"/>
 
-    </LinearLayout>
+    </RelativeLayout>
 
 </androidx.coordinatorlayout.widget.CoordinatorLayout>