picard: add patch to use Haiku Qt style (#4018)

media-sound/picard/patches/picard-2.1.3.patchset

@@ -73,3 +73,28 @@ index 7d003ccf..bacd8a13 100644
          webbrowser.open(url)
 --
 2.21.0
+
+From b9e96ea8fd0907c797b2424986023941ee8e1474 Mon Sep 17 00:00:00 2001
+From: Philipp Wolfer <ph.wolfer@gmail.com>
+Date: Fri, 19 Jul 2019 10:37:17 +0000
+Subject: [PATCH 4/4] Haiku: use Haiku Qt style
+
+---
+ picard/tagger.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/picard/tagger.py b/picard/tagger.py
+index f3f0ff85..daf76a41 100644
+--- a/picard/tagger.py
++++ b/picard/tagger.py
+@@ -130,7 +130,7 @@ class Tagger(QtWidgets.QApplication):
+
+         # Use the new fusion style from PyQt5 for a modern and consistent look
+         # across all OSes.
+-        if sys.platform != "darwin":
++        if sys.platform not in ("darwin", "haiku1"):
+             self.setStyle('Fusion')
+
+         # Set the WM_CLASS to 'MusicBrainz-Picard' so desktop environments
+--
+2.21.0