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stream_data: Add a comment explaining more topics logic.

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This commit is contained in:
Tim Abbott
2019-03-15 09:34:18 -07:00
parent ba0418c989
commit b58d3a37a7
1 changed files with 4 additions and 2 deletions
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6
static/js/stream_data.js
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@@ -357,9 +357,11 @@ exports.get_announcement_only = function (stream_name) {
};
exports.all_topics_in_cache = function (sub) {
// Checks whether this browser's cache in message_list.all has all
// Checks whether this browser's cache of contiguous messages
// (used to locally render narrows) in message_list.all has all
// messages from a given stream, and thus all historical topics
// for it.
// for it. Because message_list.all is a range, we just need to
// compare it to the range of history on the stream.
// If the cache isn't initialized, it's a clear false.
if (message_list.all === undefined || message_list.all.empty()) {