From 3984326ee335da301f6d1c2440a2f176ba57a65b Mon Sep 17 00:00:00 2001
From: David Kocik <kocikdav@gmail.com>
Date: Wed, 26 Aug 2020 10:49:42 +0200
Subject: [PATCH] notification init() at first render, not notification
 creation. Hopefully a fix of issue #4647.

---
 src/slic3r/GUI/NotificationManager.cpp |  7 ++++++-
 src/slic3r/GUI/NotificationManager.hpp | 11 ++++++-----
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/slic3r/GUI/NotificationManager.cpp b/src/slic3r/GUI/NotificationManager.cpp
index e27a4215c..47962f4b2 100644
--- a/src/slic3r/GUI/NotificationManager.cpp
+++ b/src/slic3r/GUI/NotificationManager.cpp
@@ -49,13 +49,17 @@ NotificationManager::PopNotification::PopNotification(const NotificationData &n,
     , m_text2               (n.text2)
 	, m_evt_handler         (evt_handler)
 {
-	init();
+	//init();
 }
 NotificationManager::PopNotification::~PopNotification()
 {
 }
 NotificationManager::PopNotification::RenderResult NotificationManager::PopNotification::render(GLCanvas3D& canvas, const float& initial_y)
 {
+	if (!m_initialized)
+	{
+		init();
+	}
 	if (m_finished)
 		return RenderResult::Finished;
 	if (m_close_pending) {
@@ -228,6 +232,7 @@ void NotificationManager::PopNotification::init()
 		}
 		m_lines_count++;
 	}
+	m_initialized = true;
 }
 void NotificationManager::PopNotification::set_next_window_size(ImGuiWrapper& imgui)
 { 
diff --git a/src/slic3r/GUI/NotificationManager.hpp b/src/slic3r/GUI/NotificationManager.hpp
index 0b066a3a0..a11d08394 100644
--- a/src/slic3r/GUI/NotificationManager.hpp
+++ b/src/slic3r/GUI/NotificationManager.hpp
@@ -121,6 +121,7 @@ public:
 		const NotificationData m_data;
 
 		int              m_id;
+		bool			 m_initialized          { false };
 		// Main text
 		std::string      m_text1;
 		// Clickable text
@@ -131,12 +132,12 @@ public:
 		long             m_remaining_time;
 		bool             m_counting_down;
 		long             m_last_remaining_time;
-		bool             m_paused{ false };
-		int              m_countdown_frame{ 0 };
-		bool             m_fading_out{ false };
+		bool             m_paused               { false };
+		int              m_countdown_frame      { 0 };
+		bool             m_fading_out           { false };
 		// total time left when fading beggins
-		float            m_fading_time{ 0.0f }; 
-		float            m_current_fade_opacity{ 1.f };
+		float            m_fading_time          { 0.0f }; 
+		float            m_current_fade_opacity { 1.f };
 		// If hidden the notif is alive but not visible to user
 		bool             m_hidden               { false };
 		//  m_finished = true - does not render, marked to delete