MAINT: Remove Long and WidePanel
Deprecated since 0.17.0.

xref #10892
any doc references to these? (prob not, but give a check) looks like a minor flake issue. i can fix on merge. ping when everything else is green. (or you can repush up to you). > any doc references to these? (prob not, but give a check)

Didn't find any when I did a GitHub search

> looks like a minor flake issue

Yep, found it.  Will patch on repush # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=h1) Report
> Merging [#15748](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/771e36c32f922c6a0c4a147f08fef32a011d534f?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `100%`.


```diff
@@            Coverage Diff             @@
##           master   #15748      +/-   ##
==========================================
- Coverage   91.01%   90.99%   -0.02%     
==========================================
  Files         143      143              
  Lines       49401    49393       -8     
==========================================
- Hits        44962    44947      -15     
- Misses       4439     4446       +7
```


| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/panel.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...fedc78d8681954d0c864156d18eb2a11f5559c57?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcGFuZWwucHk=) | `97.78% <ø> (+0.55%)` | :arrow_up: |
| [pandas/core/api.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...fedc78d8681954d0c864156d18eb2a11f5559c57?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXBpLnB5) | `100% <100%> (ø)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...fedc78d8681954d0c864156d18eb2a11f5559c57?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...fedc78d8681954d0c864156d18eb2a11f5559c57?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `90.96% <0%> (-0.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...fedc78d8681954d0c864156d18eb2a11f5559c57?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.86% <0%> (-0.1%)` | :arrow_down: |
| [pandas/tseries/index.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...fedc78d8681954d0c864156d18eb2a11f5559c57?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvaW5kZXgucHk=) | `95.29% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=footer). Last update [771e36c...c0ed05e](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...c0ed05e7b6c98c3eaf0c44c54f08ca0e52964630?src=pr&el=footer&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments). # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=h1) Report
> Merging [#15748](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/771e36c32f922c6a0c4a147f08fef32a011d534f?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `100%`.


```diff
@@            Coverage Diff             @@
##           master   #15748      +/-   ##
==========================================
- Coverage   91.01%      91%   -0.02%     
==========================================
  Files         143      143              
  Lines       49401    49392       -9     
==========================================
- Hits        44962    44947      -15     
- Misses       4439     4445       +6
```


| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/panel.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...c0ed05e7b6c98c3eaf0c44c54f08ca0e52964630?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcGFuZWwucHk=) | `97.78% <ø> (+0.55%)` | :arrow_up: |
| [pandas/core/api.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...c0ed05e7b6c98c3eaf0c44c54f08ca0e52964630?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXBpLnB5) | `100% <100%> (ø)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...c0ed05e7b6c98c3eaf0c44c54f08ca0e52964630?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...c0ed05e7b6c98c3eaf0c44c54f08ca0e52964630?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `90.96% <0%> (-0.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...c0ed05e7b6c98c3eaf0c44c54f08ca0e52964630?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.86% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15748?src=pr&el=footer). Last update [771e36c...c0ed05e](https://codecov.io/gh/pandas-dev/pandas/compare/771e36c32f922c6a0c4a147f08fef32a011d534f...c0ed05e7b6c98c3eaf0c44c54f08ca0e52964630?src=pr&el=footer&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments). thanks!