[keel] Add isUuidUrl function

src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.cpp

@@ -231,6 +231,7 @@ void TileSheetEditorModel::setActiveSubsheet(TileSheet::SubSheetIdx const&idx) n
 	m_activeSubsSheetIdx = idx;
 	this->activeSubsheetChanged.emit(m_activeSubsSheetIdx);
 	clearSelection();
+	m_lastDrawUpdatePt = {-1, -1};
 }
 
 void TileSheetEditorModel::fill(ox::Point const&pt, int const palIdx) noexcept {

src/olympic/keel/include/keel/media.hpp

@@ -60,6 +60,11 @@ ox::Result<ox::CStringView> uuidToPath(Context &ctx, ox::StringViewCR uuid) noex
 
 ox::Result<ox::CStringView> uuidToPath(Context &ctx, ox::UUID const&uuid) noexcept;
 
+[[nodiscard]]
+constexpr bool isUuidUrl(ox::StringViewCR path) noexcept {
+	return ox::beginsWith(path, "uuid://");
+}
+
 #ifndef OX_BARE_METAL
 
 namespace detail {