Glueviz

------------------

- Drop support for Python < 3.6. [351, 353]

- No longer bundle vispy, and instead depend on the
latest stable release. [351]

- Add initial support for vectors and error bars.
[358]

--------------------

* Remove bundled echo package and list as a dependency. [2125]

* Add the ability to export Python scripts for the profile viewer. [2082]

* Add support for polar and other non-rectilinear projections in
2-d scatter viewer [2170]

* Add legend for matplotlib viewers (in qt and in export scripts) [2097, 2144, 2146]

* Add new registry to apply in-place patches to the session file [2127]

* Initial support for dask arrays. [2137, 2149]

* Don't sync color and transparency of image layers by default. [2116]

* Python 2.7 and 3.5 are no longer supported. [2075]

* Always use replace mode when creating a new subset. [2090]

* Fixed bugs in the profile viewer that occurred when using the profile viewer and
setting reference_data to a different value than the default one. [2078]

* Updated the data loader to be able to select directories. [2077,2080]

* Move spectral-cube data loader to glue-astronomy plugin package. [2077]

* Show session filename path in window title. [2096]

* Change ``Data.coords`` API to now rely on the API described in
https://github.com/astropy/astropy-APEs/blob/master/APE14.rst [2079]

* Update minimum required version of Astropy to 4.0. [2079]

* Added a ``DataCollection.clear()`` method to remove all datasets. [2079]

* Fixed a bug that caused profiles of subsets to not be hidden if an
existing subset was emptied. [2095]

* Improved ``IndexedData`` so that world coordinates can now be shown. [2081]

* Make loading Qt plugins optional when calling ``load_plugins``. [2112]

* Preserve ``RectangularROI`` rather than converting them to ``PolygonalROI``. [2112]

* Significantly improve performance of ``compute_fixed_resolution_buffer`` when
using linked datasets with some axes uncorrelated. [2115]

* Improve performance of profile viewer when not all layers are visible. [2115]

* Fixed missing .units on ``CoordinateComponent``. [2117]

* Improve auto-linking of astronomical datasets with WCS information. [2161]

* Fix bug that occurred when using the GUI link editor when links had
been defined programmatically. [2166]

* Add the ability to programmatically set the preferred colormap for a
dataset using ``Data.visual.preferred_cmap`` [2131, 2168]

* Fix bug that caused incorrect unit to be shown on slider for images. [2159]

* Improve performance of ``Data.compute_statistic`` for subsets. [2147]

* Fix a bug where x_att and y_att could end up being out of sync in image viewer. [2141]

--------------------

* Fix bug that caused an infinite loop in the table viewer and caused glue to
hang if too many incompatible subsets were in a table viewer. [2105]

* Fixed a bug that caused an error when an invalid data was added to the table
viewer and the table viewer was then automatically closed. [2103]

* Fixed the dropdowns for vector and error markers to not include datetime
components (since they represent absolute times, not deltas). [2102]

* Fixed a bug that caused session files that were saved with LinkCollection to
not work correctly when re-loaded. [2100]

* Fixed a bug that caused issues when saving and re-loading sessions that were
originally created using Excel data with string columns. [2101]

* Avoid converting circular selections in Matplotlib plots to polygons if
it can be avoided. [2094]

--------------------

* Fixed bugs related to auto-linking of astronomical data with WCS information. In
particular, links between datasets with celestial coordinates in a different order
or links between some higher dimensional datasets with celestial axes did not
always work correctly. [2052]

* Fixed a bug that caused the auto-linking framework to not run when opening glue from
the ``qglue()`` function. [2052]

* Fixed a limitation that caused pixel selections to not propagate to other datasets.
[2052]

* Fixed a deprecation warning related to ``add_datasets``. [2052]

* Fixed compatibility with Python 3.7.4. [2060]

* Fixed performance issue with arrays that were not in native C order. [2056]

--------------------

* Fixed bug with density map visibility when using color-coding. [2041]

* Fixed bug with incompatible subsets and density maps. [2041]

* Make sure that lines/errors/vectors are disabled when in density map mode. [2041]

--------------------

* Fixed bug that occurred when trying to add a subset to a new table
viewer (without the parent data). [2038]