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diff --git a/src/ui/dialog/debug.h b/src/ui/dialog/debug.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Dialog for displaying Inkscape messages
+ */
+/* Authors:
+ * Bob Jamison
+ * Other dudes from The Inkscape Organization
+ *
+ * Copyright (C) 2004 The Inkscape Organization
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_DIALOGS_DEBUGDIALOG_H
+#define SEEN_UI_DIALOGS_DEBUGDIALOG_H
+
+namespace Inkscape {
+namespace UI {
+namespace Dialog {
+
+
+/**
+ * @brief A very simple dialog for displaying Inkscape messages.
+ *
+ * Messages sent to g_log(), g_warning(), g_message(), ets, are routed here,
+ * in order to avoid messing with the startup console.
+ */
+class DebugDialog
+{
+public:
+ DebugDialog() = default;;
+ /**
+ * Factory method
+ */
+ static DebugDialog *create();
+
+ /**
+ * Destructor
+ */
+ virtual ~DebugDialog() = default;;
+
+
+ /**
+ * Show the dialog
+ */
+ virtual void show() = 0;
+
+ /**
+ * Do not show the dialog
+ */
+ virtual void hide() = 0;
+
+ /**
+ * @brief Clear all information from the dialog
+ *
+ * Also a public method. Remove all text from the dialog
+ */
+ virtual void clear() = 0;
+
+ /**
+ * Display a message
+ */
+ virtual void message(char const *msg) = 0;
+
+ /**
+ * Redirect g_log() messages to this widget
+ */
+ virtual void captureLogMessages() = 0;
+
+ /**
+ * Return g_log() messages to normal handling
+ */
+ virtual void releaseLogMessages() = 0;
+
+ /**
+ * Factory method. Use this to create a new DebugDialog
+ */
+ static DebugDialog *getInstance();
+
+ /**
+ * Show the instance above
+ */
+ static void showInstance();
+};
+
+} //namespace Dialogs
+} //namespace UI
+} //namespace Inkscape
+
+#endif /* __DEBUGDIALOG_H__ */
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :