diff --git a/0022-on.text_input b/0022-on.text_input
index 55efe6c..204a36a 100644
--- a/0022-on.text_input
+++ b/0022-on.text_input
@@ -1,24 +1,13 @@
 on.text_input = function(t)
 	print('text input', t)
-	if Cursor_node then
+	if Cursor_node and Cursor_node.editor.cursor_x then
 		local old_top = {line=Cursor_node.editor.screen_top1.line, pos=Cursor_node.editor.screen_top1.pos}
 		edit.text_input(Cursor_node.editor, t)
-		if not eq(Cursor_node.editor.screen_top1, old_top) then
-			Viewport.y = Cursor_node.y + y_of_schema1(Cursor_node.editor, Cursor_node.editor.screen_top1)
-			-- Most of the time, we update the screen_top of nodes from Viewport.y.
-			-- But here we went the other way.
-			-- It's very important to avoid creating a recurrence, to avoid running
-			-- both sides of this feedback loop in a single frame. These apps are
-			-- not very numerically precise (e.g. we force text lines to start at
-			-- integer pixels regardless of zoom, because that keeps text crisp),
-			-- and the computations of Viewport.y and node.top will almost certainly
-			-- not converge. The resulting bugs are extremely difficult to chase
-			-- down.
-			-- The optional skip_updating_screen_top_for arg ensures we don't run
-			-- the other side of the feedback loop.
-			A(--[[skip updating screen_top for]] Cursor_node)
-			return
+		pan_viewport_to_contain_cursor(Cursor_node)
+		if eq(Cursor_node.editor.screen_top1, old_top) then
+			B()
+		else
+			A()
 		end
-		B()
 	end
 end
diff --git a/0030-update_editor_box b/0030-update_editor_box
index 288687c..9c82d62 100644
--- a/0030-update_editor_box
+++ b/0030-update_editor_box
@@ -1,6 +1,5 @@
-update_editor_box = function(node, skip_updating)
+update_editor_box = function(node)
 	if node.editor == nil then return end
-	if node == skip_updating then return end
 	if node.editor.font_height ~= scale(20) then
 		edit.update_font_settings(node.editor, scale(20))
 	end
diff --git a/Manual_tests.md b/Manual_tests.md
index df76836..76a68e0 100644
--- a/Manual_tests.md
+++ b/Manual_tests.md
@@ -185,7 +185,7 @@ Lua is dynamically typed. Tests can't patch over lack of type-checking.
   For example, `string.sub` should never use a `_pos`, only an `_offset`.
 
 * Some ADT/interface support would be helpful in keeping per-line state in
-  sync. Any change to line data should clear line `fragments` and
+  sync. Any change to line data should clear the derived line property
   `screen_line_starting_pos`.
 
 * Some inputs get processed in love.textinput and some in love.keypressed.
diff --git a/app.lua b/app.lua
index f968b7b..592b037 100644
--- a/app.lua
+++ b/app.lua
@@ -119,7 +119,7 @@ function love.run()
   App.files = nativefs.getDirectoryItems
   App.mkdir = nativefs.createDirectory
   App.remove = nativefs.remove
-  App.source_dir = love.filesystem.getSource()..'/'
+  App.source_dir = love.filesystem.getSource()..'/'  -- '/' should work even on Windows
   App.current_dir = nativefs.getWorkingDirectory()..'/'
   App.save_dir = love.filesystem.getSaveDirectory()..'/'
   App.get_time = love.timer.getTime