From 40d9420b00acf21d1bbe6755ad4d79be26066159 Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Wed, 3 Aug 2022 14:12:32 +1000
Subject: [PATCH] Handle deeply nested decks

---
 rslib/src/decks/tree.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/rslib/src/decks/tree.rs b/rslib/src/decks/tree.rs
index 31ea2581d..ccf8d6357 100644
--- a/rslib/src/decks/tree.rs
+++ b/rslib/src/decks/tree.rs
@@ -32,7 +32,10 @@ fn add_child_nodes(
 ) {
     while let Some((id, name)) = names.peek() {
         let split_name: Vec<_> = name.split("::").collect();
-        match split_name.len() as u32 {
+        // protobuf refuses to decode messages with 100+ levels of nesting, and
+        // broken collections with such nesting have been found in the wild
+        let capped_len = split_name.len().min(99) as u32;
+        match capped_len {
             l if l <= parent.level => {
                 // next item is at a higher level
                 return;