Revert "Potential fix for #1616."

This reverts commit c74b81a.

src/textual/widget.py

@@ -1959,23 +1959,13 @@ def _get_scrollable_region(self, region: Region) -> Region:
         """
         show_vertical_scrollbar, show_horizontal_scrollbar = self.scrollbars_enabled
 
-        styles = self.styles
-        scrollbar_size_horizontal = styles.scrollbar_size_horizontal
-        scrollbar_size_vertical = styles.scrollbar_size_vertical
+        scrollbar_size_horizontal = self.styles.scrollbar_size_horizontal
+        scrollbar_size_vertical = self.styles.scrollbar_size_vertical
 
-        if styles.scrollbar_gutter == "stable":
+        if self.styles.scrollbar_gutter == "stable":
             # Let's _always_ reserve some space, whether the scrollbar is actually displayed or not:
             show_vertical_scrollbar = True
-            scrollbar_size_vertical = styles.scrollbar_size_vertical
-
-        overflow_x = styles.overflow_x
-        show_horizontal_scrollbar = (
-            show_horizontal_scrollbar or overflow_x == "scroll"
-        ) and overflow_x != "hidden"
-        overflow_y = styles.overflow_y
-        show_vertical_scrollbar = (
-            show_vertical_scrollbar or overflow_y == "scroll"
-        ) and overflow_y != "hidden"
+            scrollbar_size_vertical = self.styles.scrollbar_size_vertical
 
         if show_horizontal_scrollbar and show_vertical_scrollbar:
             (region, _, _, _) = region.split(