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Ensure the cursor node is set to None when the tree goes empty

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Up until now there wasn't really a way for the tree to go empty, outside of
clear/reset. Now that we can remove nodes on the fly, that is possible. This
takes that into account.

See #2462.
This commit is contained in:
Dave Pearson
2023-05-08 09:16:58 +01:00
parent 2c39f50150
commit f34e738ddd
1 changed files with 2 additions and 0 deletions
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src/textual/widgets/_tree.py
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@@ -845,6 +845,8 @@ class Tree(Generic[TreeDataType], ScrollView, can_focus=True):
self._cursor_node = node self._cursor_node = node
if previous_node != node: if previous_node != node:
self.post_message(self.NodeHighlighted(node)) self.post_message(self.NodeHighlighted(node))
else:
self._cursor_node = None
def watch_guide_depth(self, guide_depth: int) -> None: def watch_guide_depth(self, guide_depth: int) -> None:
self._invalidate() self._invalidate()