Make Preference icon optional

ui/src/main/java/de/mm20/launcher2/ui/component/preferences/Preference.kt

@@ -4,6 +4,7 @@ import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.Icon
 import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Surface
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
@@ -13,12 +14,16 @@ import androidx.compose.ui.unit.dp
 
 @Composable
 fun Preference(
-    icon: ImageVector,
+    icon: ImageVector?,
     title: String,
     summary: String? = null,
     onClick: () -> Unit = {},
     controls: @Composable (() -> Unit)? = null
 ) {
+    Surface(
+        modifier = Modifier.fillMaxWidth(),
+        elevation = 0.dp
+    ) {
         Row(
             verticalAlignment = Alignment.CenterVertically,
             modifier = Modifier
@@ -26,12 +31,19 @@ fun Preference(
                 .clickable(onClick = onClick)
                 .padding(horizontal = 16.dp, vertical = 16.dp),
         ) {
+            Box(
+                modifier = Modifier.width(56.dp),
+                contentAlignment = Alignment.CenterStart
+            ) {
+                if (icon != null) {
                     Icon(
+                        modifier = Modifier.padding(start = 4.dp),
                         imageVector = icon,
                         contentDescription = null,
-            modifier = Modifier.padding(end = 24.dp),
                         tint = MaterialTheme.colors.primary
                     )
+                }
+            }
             Column(
                 modifier = Modifier.weight(1f)
             ) {
@@ -52,4 +64,6 @@ fun Preference(
                 }
             }
         }
+    }
+
 }