From 588022e376a57fea551b56bff321d3948bbc9ad2 Mon Sep 17 00:00:00 2001
From: Noisyfox <timemanager.rick@gmail.com>
Date: Sat, 8 Mar 2025 17:22:27 +0800
Subject: [PATCH] Don't reset gcode preview when open as gcode viewer

---
 src/slic3r/GUI/BackgroundSlicingProcess.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index a71e7cca0d3..c27f99b1eee 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -690,6 +690,15 @@ Print::ApplyStatus BackgroundSlicingProcess::apply(const Model &model, const Dyn
 	DynamicPrintConfig new_config = config;
 	new_config.apply(*m_current_plate->config());
 	Print::ApplyStatus invalidated = m_print->apply(model, new_config);
+
+	// Orca: prevent resetting under gcode viewer mode
+    if (invalidated != PrintBase::APPLY_STATUS_UNCHANGED) {
+        const auto plater = GUI::wxGetApp().mainframe->m_plater;
+        if (plater && plater->only_gcode_mode()) {
+            invalidated = PrintBase::APPLY_STATUS_UNCHANGED;
+        }
+    }
+
 	if ((invalidated & PrintBase::APPLY_STATUS_INVALIDATED) != 0 && m_print->technology() == ptFFF &&
 		!m_fff_print->is_step_done(psGCodeExport)) {
 		// Some FFF status was invalidated, and the G-code was not exported yet.