rusackas commented on code in PR #42910:
URL: https://github.com/apache/superset/pull/42910#discussion_r4153174510


##########
superset-frontend/src/explore/components/controls/IntervalColorsControl/legacyColors.ts:
##########
@@ -0,0 +1,60 @@
+/**
+ * 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[] => {
+  const schemeColors =
+    getCategoricalSchemeRegistry().get(colorScheme)?.colors ?? [];
+  const indices = (legacyIntervalColorIndices ?? '')
+    .split(',')
+    .map(part => part.trim())
+    .map(part => (part === '' ? NaN : Number(part)));
+  return bounds.map((_, index) => {
+    const legacyIndex = indices[index];
+    if (schemeColors.length === 0) return '';
+    if (Number.isFinite(legacyIndex)) {
+      return schemeColors[
+        (((legacyIndex - 1) % schemeColors.length) + schemeColors.length) %
+          schemeColors.length
+      ];
+    }
+    return schemeColors[index % schemeColors.length];

Review Comment:
   Good catch, fixed. The fallback was using the bound's absolute position 
instead of counting just the entries missing a legacy index.



##########
superset-frontend/src/explore/components/controls/IntervalColorsControl/index.tsx:
##########
@@ -0,0 +1,94 @@
+/**
+ * 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 { t } from '@apache-superset/core/translation';
+import { getCategoricalSchemeRegistry } from '@superset-ui/core';
+import ControlHeader from '../../ControlHeader';
+import ColorPickerControl from '../ColorPickerControl';
+import type { ColorPickerValue } from '../ColorPickerControl';
+import {
+  RangeRow as IntervalRow,
+  RangeLabel as BoundLabel,
+  replaceColorAtIndex,
+} from '../shared/RangeColorRow';
+import { IntervalColorsControlProps } from './types';
+import {
+  parseIntervalBounds as parseBounds,
+  resolveLegacyIntervalColors as resolveLegacyColors,
+} from './legacyColors';
+
+/**
+ * Per-interval color editor for the Gauge chart. Row *count* is driven by
+ * the sibling `intervals` control (one row per parsed upper bound) so bound
+ * values keep a single source of truth; this control only owns colors,
+ * stored as an array of hex strings positionally matched to those bounds.
+ */
+export default function IntervalColorsControl({
+  value,
+  onChange,
+  intervals,
+  legacyIntervalColorIndices,
+  colorScheme,
+  ...headerProps
+}: IntervalColorsControlProps) {
+  const bounds = parseBounds(intervals);
+  const legacyColors = resolveLegacyColors(
+    bounds,
+    legacyIntervalColorIndices,
+    colorScheme,
+  );
+  const schemeColors =
+    getCategoricalSchemeRegistry().get(colorScheme)?.colors ?? [];
+
+  const colorAt = (index: number): string =>
+    value?.[index] ||
+    legacyColors[index] ||
+    schemeColors[index % (schemeColors.length || 1)] ||
+    '';
+
+  const handleColorChange = (index: number) => (color: ColorPickerValue) => {
+    if (typeof color !== 'string') return;
+    onChange?.(replaceColorAtIndex(bounds.length, index, color, colorAt));
+  };

Review Comment:
   Good catch, added the same `isRangesInputComplete` guard here and disabled 
the picker until the bounds list is complete.



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