fix(dashboard): offer Exit edit mode when there is nothing to discard

[rusackas]

SUMMARY

Follow-up to #40832, which disabled the Discard button when a dashboard edit session has no unsaved changes. That fixed the misleading affordance (Discard had nothing to discard), but as @sadpandajoe noted on that PR, it left the edit-mode toolbar with no way back to view mode on a pristine session: Save and Discard are both disabled, and the "..." menu has no exit item, so the only escape is a page refresh or navigating away.

This keeps the button always enabled, and swaps the label based on state: Discard when there are unsaved changes, Exit edit mode when there are none. The click handler is identical in both cases (drops the ?edit param and returns to view mode), so the label always describes what actually happens.

If @yousoph / @kasiazjc would rather see a different treatment (a separate exit control, different wording, etc.), happy to iterate. This is meant as the smallest change that removes the dead end.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before: on a pristine edit session, Discard is disabled and there is no toolbar path back to view mode.
After: the same button reads "Exit edit mode" and is clickable; with unsaved changes it reads "Discard" exactly as before.

TESTING INSTRUCTIONS

1. Open any dashboard and click Edit dashboard.
2. Without changing anything, confirm the secondary button reads Exit edit mode and is enabled; clicking it returns to view mode.
3. Re-enter edit mode and make a change (drag a chart, rename). Confirm the button now reads Discard and discards on click.
4. Undo/redo and Save behavior are unchanged.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

🤖 Generated with Claude Code

[bito-code-review]

Code Review Agent Run #03edc2

Actionable Suggestions - 0

Additional Suggestions - 1

• superset-frontend/src/dashboard/components/Header/Header.test.tsx - 1

  • Test coverage gap for button click · Line 525-527
    The test at line 525 only verifies the button is enabled, but doesn't validate the click behavior when there are no unsaved changes. Add assertions to verify that clicking the button triggers the expected navigation (e.g., checking that the edit URL parameter is removed).

Filtered by Review Rules

Bito filtered these suggestions based on rules created automatically for your feedback. Manage rules.

• superset-frontend/src/dashboard/components/Header/index.tsx - 1

  • CWE-835: Unsaved changes lost on exit · Line 725-725

Review Details

• Files reviewed - 2 · Commit Range: f898981..f898981

  • superset-frontend/src/dashboard/components/Header/Header.test.tsx
  • superset-frontend/src/dashboard/components/Header/index.tsx
• Files skipped - 0
• Tools

  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.18%. Comparing base (751f5eb) to head (f898981).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #42208      +/-   ##
==========================================
- Coverage   65.19%   65.18%   -0.01%     
==========================================
  Files        2767     2767              
  Lines      156062   156064       +2     
  Branches    35717    35719       +2     
==========================================
- Hits       101741   101737       -4     
- Misses      52361    52367       +6     
  Partials     1960     1960              

Flag	Coverage Δ
javascript	70.82% <100.00%> (-0.01%)	⬇️

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