fix: hex8 regression #10578 (#10773)

packages/common/src/colors.ts

@@ -346,7 +346,7 @@ export const normalizeInputColor = (color: string): string | null => {
   if (tc.isValid()) {
     // testing for `#` first fixes a bug on Electron (more specfically, an
     // Obsidian popout window), where a hex color without `#` is considered valid
-    if (tc.getFormat() === "hex" && !color.startsWith("#")) {
+    if (["hex", "hex8"].includes(tc.getFormat()) && !color.startsWith("#")) {
       return `#${color}`;
     }
     return color;

packages/excalidraw/tests/colorInput.test.ts

@@ -22,9 +22,8 @@ describe("normalizeInputColor", () => {
     });
 
     it("does NOT add hash to hexa without hash (tinycolor detects as hex8, not hex)", () => {
-      // Note: tinycolor detects 8-digit hex as "hex8" format, not "hex",
-      // so the hash prefix logic doesn't apply
-      expect(normalizeInputColor("ff000080")).toBe("ff000080");
+      // Note: tinycolor detects 8-digit hex as "hex8" format, not "hex"
+      expect(normalizeInputColor("ff000080")).toBe("#ff000080");
     });
   });