aloktomarr opened a new pull request, #21695:
URL: https://github.com/apache/echarts/pull/21695
## Brief Information
This pull request is in the type of:
- [x] bug fixing
- [ ] new feature
- [ ] others
### What does this PR do?
Stops the toolbox dataZoom "back"/zoom-reset from dispatching a redundant
action once the chart is already back at its original range.
### Fixed issues
- close #21660
## Details
### Before: What was the problem?
The dataZoom zoom history keeps the original (un-zoomed) range as the base
snapshot, then pushes one snapshot per zoom. `history.pop()` did not stop when
only that base snapshot remained — it still returned the origin as a restorable
snapshot. So the toolbox "back"/zoom-reset could be triggered one extra time
(e.g. 3× after 2 zooms across multiple grids), dispatching a redundant
`dataZoom` action that "restores" a range that is already current.
Reproduction (from #21660): open the `grid-multiple` example, zoom the upper
chart once and the lower chart once (2 zooms), then click Zoom Reset — it can
be triggered 3 times.
### After: How does it behave after the fixing?
`history.pop()` now returns an empty snapshot when only the origin remains
(nothing left to undo). Its only caller — the toolbox dataZoom `back` handler —
already guards on `batch.length`, so no redundant `dataZoom` action is
dispatched. After 2 zooms, reset now triggers exactly 2 times.
Added a unit test (`test/ut/spec/component/dataZoom/history.test.ts`)
covering push/pop/count and the regression: popping when only the origin
remains returns `{}`.
## Document Info
- [x] This PR doesn't relate to document changes
## Misc
### Security Checking
- [ ] This PR uses security-sensitive Web APIs.
### ZRender Changes
- [ ] This PR depends on ZRender changes (ecomfe/zrender#xxx).
### Related test cases or examples to use the new APIs
Unit test: `test/ut/spec/component/dataZoom/history.test.ts`
### Merging options
- [ ] Please squash the commits into a single one when merging.
### Other information
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