[M3][Dialog] Fix dialog paddings

We missed to include top/bottom insets of button styles into dialog action margin calculation. Also the paddings between titles and messages were not correct.

PiperOrigin-RevId: 417626927

Author: drchen

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

@@ -52,13 +52,21 @@
 
   <dimen name="mtrl_btn_snackbar_margin_horizontal">8dp</dimen>
 
+
+  <!-- LINT.IfChange -->
   <dimen name="m3_btn_inset">4dp</dimen>
+  <!-- LINT.ThenChange(../../../dialog/res/values/dimens.xml) -->
+
   <dimen name="m3_btn_max_width">320dp</dimen>
   <dimen name="m3_btn_stroke_size">1dp</dimen>
   <dimen name="m3_btn_padding_left">24dp</dimen>
   <dimen name="m3_btn_padding_right">24dp</dimen>
+
+  <!-- LINT.IfChange -->
   <dimen name="m3_btn_padding_top">6dp</dimen>
   <dimen name="m3_btn_padding_bottom">6dp</dimen>
+  <!-- LINT.ThenChange(../../../dialog/res/values/dimens.xml) -->
+
   <dimen name="m3_btn_elevation">0dp</dimen>
   <dimen name="m3_btn_elevated_btn_elevation">1dp</dimen>
   <dimen name="m3_btn_icon_btn_padding_left">16dp</dimen>

lib/java/com/google/android/material/dialog/res/layout/m3_alert_dialog_actions.xml

@@ -31,8 +31,8 @@
       android:orientation="horizontal"
       android:paddingLeft="?attr/dialogPreferredPadding"
       android:paddingRight="?attr/dialogPreferredPadding"
-      android:paddingTop="18dp"
-      android:paddingBottom="18dp">
+      android:paddingTop="@dimen/m3_alert_dialog_action_top_padding"
+      android:paddingBottom="@dimen/m3_alert_dialog_action_bottom_padding">
 
     <Button
         android:id="@android:id/button3"

lib/java/com/google/android/material/dialog/res/values/dimens.xml

@@ -27,5 +27,10 @@
   <dimen name="m3_alert_dialog_corner_size">28dp</dimen>
   <dimen name="m3_alert_dialog_icon_size">24dp</dimen>
   <dimen name="m3_alert_dialog_icon_margin">16dp</dimen>
-  <dimen name="m3_alert_dialog_title_bottom_margin">10dp</dimen>
+  <dimen name="m3_alert_dialog_title_bottom_margin">16dp</dimen>
+
+  <!-- equals 24dp - @dimen/m3_btn_padding_top (6dp) - @dimen/m3_btn_inset (4dp) -->
+  <dimen name="m3_alert_dialog_action_top_padding">14dp</dimen>
+  <!-- equals 24dp - @dimen/m3_btn_padding_bottom (6dp) - @dimen/m3_btn_inset (4dp) -->
+  <dimen name="m3_alert_dialog_action_bottom_padding">14dp</dimen>
 </resources>