From c16d6b3d8d02c35006ed277a8d98c53b2a77d61d Mon Sep 17 00:00:00 2001
From: Guldoman <giulio.lettieri@gmail.com>
Date: Tue, 7 Dec 2021 21:45:20 +0100
Subject: [PATCH] Avoid drawing hidden `TreeView` items

---
 data/plugins/treeview.lua | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/data/plugins/treeview.lua b/data/plugins/treeview.lua
index 18d622e1..8edee393 100644
--- a/data/plugins/treeview.lua
+++ b/data/plugins/treeview.lua
@@ -366,15 +366,18 @@ end
 
 function TreeView:draw()
   self:draw_background(style.background2)
+  local _y, _h = self.position.y, self.size.y
 
   local doc = core.active_view.doc
   local active_filename = doc and system.absolute_path(doc.filename or "")
 
   for item, x,y,w,h in self:each_item() do
-    self:draw_item(item,
-      item.abs_filename == active_filename,
-      item == self.hovered_item,
-      x, y, w, h)
+    if y + h >= _y and y < _y + _h then
+      self:draw_item(item,
+        item.abs_filename == active_filename,
+        item == self.hovered_item,
+        x, y, w, h)
+    end
   end
 
   self:draw_scrollbar()