VIM: search_refresh limits message count to 2 * window.height

diff --git a/22/32ab14d78ddb5b51e652ae85aa84c1170d0196 b/22/32ab14d78ddb5b51e652ae85aa84c1170d0196
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+Date: Fri, 10 Oct 2014 17:56:23 +0200\r
+Message-ID: <20141010175623.GB7504@TP_L520.localdomain>\r
+From: Franz Fellner <alpine.art.de@gmail.com>\r
+To: notmuch@notmuchmail.org\r
+Subject: VIM: search_refresh limits message count to 2 * window.height\r
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+\r
+The reason is that StagedRender.is_ready depends on last_render, which\r
+get's set to VIM::Buffer.count() in StagedRender::do_next.\r
+I do not (yet) know what exactly happens, but after the first call to\r
+search refresh last_render never get's less than 2*2*window.height.\r
+That means once you do search_refresh StagedRender never will be ready -\r
+is_ready returns false, so s:show_cursor_moved never will advance the\r
+StagedRender.\r
+\r
+I am trying to understand the code, but it's a hard time for me ;)\r