fix scroll to top

src/textual/geometry.py

@@ -320,7 +320,7 @@ class Region(NamedTuple):
             Offset: An offset required to add to region to move it inside window_region.
         """
 
-        if region in window_region:
+        if region in window_region and not top:
             # Region is already inside the window, so no need to move it.
             return NULL_OFFSET
 
@@ -341,19 +341,19 @@ class Region(NamedTuple):
                 key=abs,
             )
 
-        if not (
+        if top:
+            delta_y = top_ - window_top
+
+        elif not (
             (window_bottom > top_ >= window_top)
             and (window_bottom > bottom >= window_top)
         ):
             # The window needs to scroll on the Y axis to bring region in to view
-            if top:
-                delta_y = top_ - window_top
-            else:
-                delta_y = min(
-                    top_ - window_top,
-                    top_ - (window_bottom - region.height),
-                    key=abs,
-                )
+            delta_y = min(
+                top_ - window_top,
+                top_ - (window_bottom - region.height),
+                key=abs,
+            )
         return Offset(delta_x, delta_y)
 
     def __bool__(self) -> bool:

src/textual/widget.py

@@ -1805,7 +1805,7 @@ class Widget(DOMNode):
         if spacing is not None:
             window = window.shrink(spacing)
 
-        if window in region:
+        if window in region and not top:
             return Offset()
 
         delta_x, delta_y = Region.get_scroll_to_visible(window, region, top=top)

src/textual/widgets/_tree.py

@@ -805,7 +805,7 @@ class Tree(Generic[TreeDataType], ScrollView, can_focus=True):
             cursor_line = meta["line"]
             if meta.get("toggle", False):
                 node = self.get_node_at_line(cursor_line)
-                if node is not None and self.auto_expand:
+                if node is not None:
                     self._toggle_node(node)
 
             else: