sadpandajoe commented on code in PR #42910:
URL: https://github.com/apache/superset/pull/42910#discussion_r4312275369


##########
superset-frontend/src/explore/components/controls/IntervalColorsControl/legacyColors.ts:
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@@ -0,0 +1,64 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { getCategoricalSchemeRegistry } from '@superset-ui/core';
+
+export const parseIntervalBounds = (intervals?: string): number[] =>
+  (intervals ?? '')
+    .split(',')
+    .map(part => part.trim())
+    .filter(part => part !== '')
+    .map(Number)
+    .filter(bound => Number.isFinite(bound));
+
+/**
+ * Resolves the legacy `interval_color_indices` control (comma-separated,
+ * 1-indexed positions into the chosen categorical color scheme) into real
+ * hex colors, positionally matched to `bounds`. Shared by the control panel
+ * (display-only fallback while a legacy chart is being edited) and by
+ * `handleDeprecatedControls` (which migrates the value into `interval_colors`
+ * on load, since `interval_color_indices` is no longer a registered control
+ * and would otherwise be silently dropped on the next save).
+ */
+export const resolveLegacyIntervalColors = (
+  bounds: number[],
+  legacyIntervalColorIndices: string | undefined,
+  colorScheme: string | undefined,
+): string[] => {
+  // Non-strict lookup mirrors the Gauge renderer: an unregistered scheme
+  // falls back to the registry's default scheme.
+  const schemeColors =
+    getCategoricalSchemeRegistry().get(colorScheme)?.colors ?? [];

Review Comment:
   Replaying the analogous-color expansion isn't needed to avoid the wrong 
color. The wrong value is only written because an index past the static palette 
(10 on a 9-color scheme) is wrapped modulo 9 and then persisted once any row is 
edited. Could `resolveLegacyIntervalColors` skip resolution (leave the legacy 
indices untouched) whenever any index exceeds the scheme length, so those 
charts keep rendering through the renderer's own path?



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