layout/scrolling: Update view offset on config update

Fix always-centering not applied right away. No other changes intended.

src/layout/scrolling.rs

@@ -293,6 +293,11 @@ impl<W: LayoutElement> ScrollingSpace<W> {
         self.working_area = working_area;
         self.scale = scale;
         self.options = options;
+
+        // Apply always-center and such right away.
+        if !self.columns.is_empty() && !self.view_offset.is_gesture() {
+            self.animate_view_offset_to_column(None, self.active_column_idx, None);
+        }
     }
 
     pub fn update_shaders(&mut self) {