Added cap on max number of unread lines to load
This is to improve performance when switching to a buffer with a large number of unread lines. Fixes #859 Thanks to @lorenzhs for the comments on PR #862.
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1 changed files with 3 additions and 5 deletions
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@ -145,11 +145,9 @@ weechat.controller('WeechatCtrl', ['$rootScope', '$scope', '$store', '$timeout',
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$rootScope.$on('activeBufferChanged', function(event, unreadSum) {
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var ab = models.getActiveBuffer();
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// Discard surplus lines. This is done *before* lines are fetched because that saves us the effort of special handling for the
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// case where a buffer is opened for the first time ;)
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var minRetainUnread = ab.lines.length - unreadSum + 5; // do not discard unread lines and keep 5 additional lines for context
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var surplusLines = ab.lines.length - (2 * $scope.lines_per_screen + 10); // retain up to 2*(screenful + 10) + 10 lines because magic numbers
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var linesToRemove = Math.min(minRetainUnread, surplusLines);
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// Discard unread lines above 2 screenfuls. We can click through to get more if needs be
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// This is to keep GB responsive when loading buffers which have seen a lot of traffic. See issue #859
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var linesToRemove = ab.lines.length - (2 * $scope.lines_per_screen + 10);
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if (linesToRemove > 0) {
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ab.lines.splice(0, linesToRemove); // remove the lines from the buffer
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