[nostalgia/core/studio] Add support for TileSheetEditor unsaved changes status

src/nostalgia/core/studio/tilesheeteditor-imgui.cpp

@@ -17,6 +17,7 @@ TileSheetEditorImGui::TileSheetEditorImGui(Context *ctx, const ox::String &path)
 	m_itemPath = path;
 	const auto lastSlash = std::find(m_itemPath.rbegin(), m_itemPath.rend(), '/').offset();
 	m_itemName = m_itemPath.substr(lastSlash + 1);
+	undoStack()->changeTriggered.connect(this, &TileSheetEditorImGui::markUnsavedChanges);
 }
 
 ox::String TileSheetEditorImGui::itemName() const noexcept {
@@ -142,4 +143,10 @@ void TileSheetEditorImGui::drawPalettePicker() noexcept {
 	}
 }
 
-}
+ox::Error TileSheetEditorImGui::markUnsavedChanges() noexcept {
+	oxDebug("markUnsavedChanges");
+	setUnsavedChanges(true);
+	return OxError(0);
+}
+
+}