[SplitButton] Update split button styles to match spec.

PiperOrigin-RevId: 705488629

Author: kendrickumstattd

catalog/java/io/material/catalog/button/res/layout/cat_split_button_fragment.xml

@@ -126,7 +126,8 @@
           android:minWidth="@dimen/mtrl_min_touch_target_size"
           android:contentDescription="@string/cat_split_button_label_edit"
           app:icon="@drawable/ic_edit_vd_theme_24dp"
-          app:iconSize="20dp"/>
+          app:iconSize="20dp"
+          app:iconPadding="0dp"/>
       <Button
           style="?attr/materialSplitButtonIconFilledTonalStyle"
           android:id="@+id/expand_more_or_less_tonal_icon"

lib/java/com/google/android/material/button/res/values/styles.xml

@@ -134,7 +134,7 @@
   </style>
 
   <style name="Widget.Material3.MaterialSplitButton" parent="Widget.Material3.MaterialButtonGroup.Connected">
-    <item name="android:spacing">0dp</item>
+    <item name="android:spacing">2dp</item>
     <item name="android:paddingTop">10dp</item>
     <item name="android:paddingBottom">10dp</item>
     <item name="innerCornerSize">@xml/m3_split_button_inner_corner_size_state_list</item>
@@ -143,6 +143,7 @@
   </style>
 
   <style name="Widget.Material3.SplitButton.IconButton.Filled" parent="Widget.Material3.Button.IconButton.Filled">
+    <item name="android:insetLeft">0dp</item>
     <item name="android:textColor">@color/m3_button_foreground_color_selector</item>
     <item name="iconTint">@color/m3_button_foreground_color_selector</item>
     <item name="backgroundTint">@color/m3_button_background_color_selector</item>
@@ -152,6 +153,7 @@
   </style>
 
   <style name="Widget.Material3.SplitButton.IconButton.Filled.Tonal" parent="Widget.Material3.Button.IconButton.Filled.Tonal">
+    <item name="android:insetLeft">0dp</item>
     <item name="android:textColor">@color/m3_button_foreground_color_selector</item>
     <item name="iconTint">@color/m3_button_foreground_color_selector</item>
     <item name="backgroundTint">@color/m3_button_background_color_selector</item>