Preserve async tile loading state - #63
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Fixes flickering during map movement when tiles are loaded asynchronously. This change adds a ValueKey to each tile widget based on its zoom level and tile coordinates.
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This change adds a stable
ValueKeyto each tile widget based on its zoom level and tile coordinates.Without a key, Flutter could recreate tile widgets when the tile stack changed during map movement. This caused async tile loading state to be lost and resulted in visible tile flickering.
By preserving tile widget identity, ongoing async loading is maintained across rebuilds.