print to output buffer in all callbacks

0050-print_to_output

@@ -2,4 +2,5 @@ print_to_output = function(...)
 	local line = table.concat(map({...}, tostring), ' ')
 	table.insert(Current_pane.output_editor_state.lines,
 		{data=line})
+	Text.redraw_all(Current_pane.output_editor_state)
 end

0104-call_protected

@@ -2,7 +2,10 @@ call_protected = function(f, ...)
 	local args = {...}
 	xpcall(
 		function()
+			local old_print = print
+			print = print_to_output
 			f(unpack(args))
+			print = old_print
 		end,
 		send_errors_to_output)
 end