REL: v3.4.2

This is the second bugfix release of the 3.4.x series.

This release contains several critical bug-fixes:

* Generate wheels usable on older PyPy7.3.{0,1}
* Fix compatibility with Python 3.10
* Add `subplot_mosaic` Axes in the order the user gave them to us
* Correctly handle 'none' *facecolors* in `do_3d_projection`
* Ensure that Matplotlib is importable even if there's no HOME
* Fix `CenteredNorm` with *halfrange*
* Fix bar_label for bars with nan values
* Fix clip paths when zoomed such that they are outside the figure
* Fix creation of `RangeSlider` with *valinit*
* Fix handling of "d" glyph in backend_ps, fixing EPS output
* Fix handling of datetime coordinates in `pcolormesh` with Pandas
* Fix processing of some `errorbar` arguments
* Fix removal of shared polar Axes
* Fix resetting grid visibility
* Fix subfigure indexing error and tight bbox
* Fix textbox cursor color
* Fix TkAgg event loop error on window close
* Ignore errors for sip with no setapi (Qt4Agg import errors)

REL: v3.4.1

This is the first bugfix release of the 3.4.x series.

This release contains several critical bug-fixes:

* fix errorbar when specifying fillstyle
* fix Inkscape cleanup at exit on Windows for tests
* fix legends of colour-mapped scatter plots
* fix positioning of annotation fancy arrows
* fix size and color rendering for 3D scatter plots
* fix suptitle manual positioning when using constrained layout
* respect antialiasing settings in cairo backends as well

REL: v3.4.0

Highlights of this release include:

- Figure and Axes creation / management
    - New subfigure functionality
    - Single-line string notation for subplot_mosaic
    - Changes to behavior of Axes creation methods (gca, add_axes,
      add_subplot)
    - add_subplot/add_axes gained an axes_class parameter
    - Subplot and subplot2grid can now work with constrained layout
- Plotting methods
    - axline supports transform parameter
    - New automatic labeling for bar charts
    - A list of hatches can be specified to bar and barh
    - Setting BarContainer orientation
    - Contour plots now default to using ScalarFormatter
    - Axes.errorbar cycles non-color properties correctly
    - errorbar errorevery parameter matches markevery
    - hexbin supports data reference for C parameter
    - Support callable for formatting of Sankey labels
    - Axes.spines access shortcuts
    - New stairs method and StepPatch artist
    - Added orientation parameter for stem plots
    - Angles on Bracket arrow styles
    - TickedStroke patheffect
- Colors and colormaps
    - Collection color specification and mapping
    - Transparency (alpha) can be set as an array in collections
    - pcolormesh has improved transparency handling by enabling snapping
    - IPython representations for Colormap objects
    - Colormap.set_extremes and Colormap.with_extremes
    - Get under/over/bad colors of Colormap objects
    - New cm.unregister_cmap function
    - New CenteredNorm for symmetrical data around a center
    - New FuncNorm for arbitrary normalizations
    - GridSpec-based colorbars can now be positioned above or to the
      left of the main axes
- Titles, ticks, and labels
    - supxlabel and supylabel
    - Shared-axes subplots tick label visibility is now correct for top
      or left labels
    - An iterable object with labels can be passed to Axes.plot
- Fonts and Text
    - Text transform can rotate text direction
    - matplotlib.mathtext now supports overset and underset LaTeX
      symbols
    - math_fontfamily parameter to change Text font family
    - TextArea/AnchoredText support horizontalalignment
    - PDF supports URLs on Text artists
- rcParams improvements
    - New rcParams for dates: set converter and whether to use
      interval_multiples
    - Date formatters now respect usetex rcParam
    - Setting image.cmap to a Colormap
    - Tick and tick label colors can be set independently using rcParams
- 3D Axes improvements
    - Errorbar method in 3D Axes
    - Stem plots in 3D Axes
    - 3D Collection properties are now modifiable
    - Panning in 3D Axes
- Interactive tool improvements
    - New RangeSlider widget
    - Sliders can now snap to arbitrary values
    - Pausing and Resuming Animations
- Sphinx extensions
    - plot_directive caption option
- Backend-specific improvements
    - Consecutive rasterized draws now merged
    - Support raw/rgba frame format in FFMpegFileWriter
    - nbAgg/WebAgg support middle-click and double-click
    - nbAgg support binary communication
    - Indexed color for PNG images in PDF files when possible
    - Improved font subsettings in PDF/PS
    - Kerning added to strings in PDFs
    - Fully-fractional HiDPI in QtAgg
    - wxAgg supports fullscreen toggle

REL: v3.4.0rc3

This is the third release candidate for Matplotlib 3.4.0.

REL: v3.4.0rc2

This is the second release candidate for Matplotlib 3.4.0.

REL: v3.4.0rc1

This is the first release candidate for Matplotlib 3.4.0.

REL: v3.3.4

This is the fourth bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

* Fix WebAgg initialization.
* Fix parsing QT_API setting with mixed case.
* Fix build with LTO disabled in environment.
* Fix test compatibility with Python 3.10.
* Fix test compatibility with NumPy 1.20.
* Fix test compatibility with pytest 6.2.

REL: v3.3.3

This is the third bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

* Fix calls to `Axis.grid` with argument `visible=True`.
* Fix fully masked `imshow`.
* Fix inconsistent color mapping in scatter for 3D plots.
* Fix notebook/nbAgg figures when used with ipywidgets in the same cell.
* Fix notebook/nbAgg/WebAgg on older (e.g., Firefox ESR) browsers.
* Fix pcolormesh with `datetime` coordinates.
* Fix performance regression with `datetime`s.
* Fix singular ticks with small log ranges.
* Fix timers/animations on wx and notebook backends.
* Remove certifi as a hard runtime dependency.

REL: v3.3.2

This is the second bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

* fix Axis scale on twinned Axes
* fix auto-close of Figures in nbagg
* fix automatic title placement if Axes is off the Figure
* fix autoranging of log scales with barstacked histogram
* fix extra redraws when using Button or TextBox widgets
* fix imshow with LogNorm and large vmin/vmax ranges
* fix plotting Pandas DataFrame with string MultiIndex
* fix scatter with `marker=''`
* fix scatter3d color/linewidth re-projection
* fix state of mode buttons in TkAgg backends
* include license files in built distribution
* reduce Visual C++ runtime requirements on Windows

REL: v3.3.1

This is the first bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

* fix docstring import issues when running Python with optimization
* fix `hist` with categorical data, such as with Pandas
* fix install on BSD systems
* fix nbagg compatibility with Chrome 84+
* fix ordering of scatter marker size in 3D plots
* fix performance regression when plotting `Path`s
* fix reading from URL in `imread`
* fix several regressions with new date epoch handling
* fix some bad constrained and tight layout interactions with colorbars
* fix use of customized toolbars in TkAgg and WXAgg backends