From 4b0f72e2052cb6f377d6b22d201bbf7cffe207b9 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 22 Dec 2020 05:54:55 +0100
Subject: [PATCH] Do not bother to render waveforms < 2px high

Those are blank to begin with, nothing is drawn, yet they'd still be
cached.

This may happen during an initial exposure (see 1a49d7d42b86227),
or when deleting regions.
---
 libs/waveview/wave_view.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libs/waveview/wave_view.cc b/libs/waveview/wave_view.cc
index 127f108069..3a5c1b4fc0 100644
--- a/libs/waveview/wave_view.cc
+++ b/libs/waveview/wave_view.cc
@@ -1016,7 +1016,11 @@ WaveView::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) cons
 	Rect self;
 
 	if (!get_item_and_draw_rect_in_window_coords (area, self, draw)) {
-		assert(true);
+		assert(false);
+		return;
+	}
+
+	if (draw.height () < 2) {
 		return;
 	}