fix(powerline): keep the Custom theme when Powerline is enabled again

src/utils/__tests__/powerline-settings.test.ts

@@ -40,6 +40,20 @@ describe('powerline settings helpers', () => {
         expect(updated.powerline.theme).toBe('catppuccin');
     });
 
+    it('keeps a custom theme when enabling powerline again', () => {
+        const settings = {
+            ...DEFAULT_SETTINGS,
+            powerline: {
+                ...DEFAULT_SETTINGS.powerline,
+                enabled: false,
+                theme: 'custom'
+            }
+        };
+
+        const updated = buildEnabledPowerlineSettings(settings);
+        expect(updated.powerline.theme).toBe('custom');
+    });
+
     it('keeps manual separators alongside flex separators when enabling', () => {
         const line: WidgetItem[] = [
             { id: '1', type: 'model' },

src/utils/powerline-settings.ts

@@ -2,8 +2,10 @@ import type { Settings } from '../types/Settings';
 
 import { getDefaultPowerlineTheme } from './colors';
 
+// Only a first enable has no theme yet. 'custom' is chosen in the Themes menu,
+// which is open only while Powerline is enabled, so it is kept.
 function resolveEnabledPowerlineTheme(theme: string | undefined): string {
-    if (!theme || theme === 'custom') {
+    if (!theme) {
         return getDefaultPowerlineTheme();
     }