id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
634222648,MDU6SXNzdWU2MzQyMjI2NDg=,4129,FacetGrid colorbar horizontal orientation ,31694629,closed,0,,,4,2020-06-08T06:23:53Z,2020-06-09T07:41:22Z,2020-06-09T07:41:21Z,NONE,,,,"<!-- A short summary of the issue, if appropriate -->
When using Facetgrid with color orientation as horizontal, the map stretches and looks weird. The expected outcome should create extra space for the colorbar. 

#### MCVE Code Sample
<!-- In order for the maintainers to efficiently understand and prioritize issues, we ask you post a ""Minimal, Complete and Verifiable Example"" (MCVE): http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports -->

```python
import xarray as xr

airtemps = xr.tutorial.open_dataset('air_temperature')
air = airtemps['air']
t = air.isel(time=slice(0, 365 * 4, 250))
g_simple = t.plot(x='lon', y='lat', col='time', col_wrap=3,
                  cbar_kwargs={'orientation': 'horizontal'})
```
Output: 
![Figure 2020-06-08 114452](https://user-images.githubusercontent.com/31694629/83998615-9e001380-a97e-11ea-9fe3-e309eb3008b8.png)

#### Expected Output
![Figure 2020-06-08 114436](https://user-images.githubusercontent.com/31694629/83998319-f08d0000-a97d-11ea-84cd-ca8cec1db90a.png)


#### Problem Description
<!-- this should explain why the current behavior is a problem and why the expected output is a better solution -->
The current behavior of the changes the aspect ratio of the subplots. The addition of this feather will enable a better-looking plot and can be directly used for publishing. 

#### Versions

<details><summary>Output of <tt>xr.show_versions()</tt></summary>

<!-- Paste the output here xr.show_versions() here -->


</details>
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634212258,MDU6SXNzdWU2MzQyMTIyNTg=,4128,Add text in FacetGrid subplots,31694629,closed,0,,,2,2020-06-08T06:13:23Z,2020-06-08T15:55:01Z,2020-06-08T15:55:00Z,NONE,,,,"<!-- A short summary of the issue, if appropriate -->
Adding subplots numbers in the FacetGrid subplots. This will help in the easy generation of scientific publication quality figures.

#### MCVE Code Sample
<!-- In order for the maintainers to efficiently understand and prioritize issues, we ask you post a ""Minimal, Complete and Verifiable Example"" (MCVE): http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports -->

```python
import xarray as xr

airtemps = xr.tutorial.open_dataset('air_temperature')
air = airtemps['air']
t = air.isel(time=slice(0, 365 * 4, 250))
g_simple = t.plot(x='lon', y='lat', col='time', col_wrap=3)

#adding sub plot number
string = ['a','b','c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l']
for i, ax in enumerate(g_simple.axes.flatten()):
    ax.text(0.85, 0.85,'(' + string[i] +')',transform=ax.transAxes, 
            bbox=dict(boxstyle=""square"", fc=""w"", ec=""k""))

```

#### Expected Output
![Figure 2020-06-08 113841](https://user-images.githubusercontent.com/31694629/83997716-a2c3c800-a97c-11ea-9458-58a46c70f848.png)


#### Problem Description
<!-- this should explain why the current behavior is a problem and why the expected output is a better solution -->
Currently, there is no argument that can enable the subplot numbers in the FacetGrid subplot. In the case of scientific publications, subplots need to be numbered. The addition of this feature will enable the easy generation of good quality figures. 

#### Versions

<details><summary>Output of <tt>xr.show_versions()</tt></summary>

<!-- Paste the output here xr.show_versions() here -->
INSTALLED VERSIONS
------------------
commit: None
python: 3.7.7 (default, May  6 2020, 11:45:54) [MSC v.1916 64 bit (AMD64)]
python-bits: 64
OS: Windows
OS-release: 10
machine: AMD64
processor: Intel64 Family 6 Model 166 Stepping 0, GenuineIntel
byteorder: little
LC_ALL: None
LANG: en
LOCALE: None.None
libhdf5: 1.10.4
libnetcdf: 4.7.3

xarray: 0.15.1
pandas: 1.0.3
numpy: 1.18.1
scipy: 1.4.1
netCDF4: 1.5.3
pydap: None
h5netcdf: None
h5py: None
Nio: None
zarr: None
cftime: 1.1.2
nc_time_axis: None
PseudoNetCDF: None
rasterio: None
cfgrib: None
iris: None
bottleneck: None
dask: 2.16.0
distributed: 2.16.0
matplotlib: 3.1.3
cartopy: 0.17.0
seaborn: 0.10.1
numbagg: None
setuptools: 46.2.0.post20200511
pip: 20.0.2
conda: 4.8.3
pytest: None
IPython: 7.13.0
sphinx: 3.0.3


</details>
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