Fixed an random crash on start on Linux (#14052)

src/slic3r/GUI/GUI_App.cpp

@@ -61,6 +61,7 @@
 #include <wx/dialog.h>
 #include <wx/textctrl.h>
 #include <wx/splash.h>
+#include <wx/weakref.h>
 #include <wx/fontutil.h>
 #include <wx/glcanvas.h>
 #include <wx/utils.h>
@@ -349,6 +350,17 @@ public:
         }
     }
 
+    // Orca: keep the splash alive until it is explicitly destroyed.
+    // wxSplashScreen installs an application-wide event filter that calls
+    // Close() (which Destroy()s the window) on ANY key press or mouse-button
+    // down. Since startup keeps the splash up across the whole load_presets()
+    // and main-window-creation phase, a single stray click/keypress would
+    // destroy it while on_init_inner() still holds the pointer, causing an
+    // intermittent use-after-free crash. Override the filter to a no-op so the
+    // splash can only be removed via the explicit Destroy() once the main frame
+    // is shown.
+    int FilterEvent(wxEvent& /*event*/) override { return wxEventFilter::Event_Skip; }
+
     void scale_font(wxFont& font, float scale)
     {
 #ifdef __WXMSW__
@@ -2763,7 +2775,8 @@ bool GUI_App::on_init_inner()
         app_config->set("version", SLIC3R_VERSION);
     }
 
-    SplashScreen * scrn = nullptr;
+    // Orca: use wxWeakRef to provent wild pointer.
+    wxWeakRef<SplashScreen> scrn = nullptr;
     if (app_config->get("show_splash_screen") == "true") {
         // Detect position (display) to show the splash screen
         // Now this position is equal to the mainframe position