…t-of-pr-21140-on-v3.5.x

Backport PR matplotlib#21140 on branch v3.5.x (Docstring cleanups around DATA_PARAMETER_PLACEHOLDER.)

…t-of-pr-21136-on-v3.5.x

Backport PR matplotlib#21136 on branch v3.5.x (More (minor) plot types gallery fixes.)

…t-of-pr-21039-on-v3.5.x

… positionally to stem()

…t-of-pr-21126-on-v3.5.x

Backport PR matplotlib#21126 on branch v3.5.x (Deprecate passing formatting parameters positionally to stem())

…atplotlib#20912

…t-of-pr-20951-on-v3.5.x

Backport PR matplotlib#20951 on branch v3.5.x ([ENH]: data kwarg support for mplot3d matplotlib#20912)

…t-of-pr-19343-on-v3.5.x

Backport PR matplotlib#19343 on branch v3.5.x (Enh improve agg chunks error)

…es in docs.

…t-of-pr-21180-on-v3.5.x

Backport PR matplotlib#21180 on branch v3.5.x (Remove uninformative `.. figure::` titles in docs.)

…t-of-pr-21166-on-v3.5.x

Backport PR matplotlib#21166 on branch v3.5.x (Cleanup contour(f)3d examples.)

… >= 5.12

…t-of-pr-21081-on-v3.5.x

Backport PR matplotlib#21081 on branch v3.5.x (Improve docs for to_jshtml())

…t-of-pr-21172-on-v3.5.x

Backport PR matplotlib#21172 on branch v3.5.x (skip QImage leak workaround for PySide2 >= 5.12)

…rn/.

…t-of-pr-21192-on-v3.5.x

Backport PR matplotlib#21192 on branch v3.5.x (Discourage making style changes to extern/.)

…t-of-pr-21189-on-v3.5.x

Backport PR matplotlib#21189 on branch v3.5.x (Small doc fixes.)

…pull request was told not to change the agg files) (matplotlib#21197)

Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>

…t-of-pr-21026-on-v3.5.x

Backport PR matplotlib#21026 on branch v3.5.x (Place 3D contourf patches between levels)

…t-of-pr-21196-on-v3.5.x

Backport PR matplotlib#21196 on branch v3.5.x (Update fonts.rst)

…t-of-pr-21619-on-v3.5.x

Backport PR matplotlib#21619 on branch v3.5.x (Revert "Pin sphinx to fix sphinx-gallery")

…t-of-pr-21568-on-v3.5.x

Backport PR matplotlib#21568 on branch v3.5.x (Enhancing support for tex and datetimes)

…t-of-pr-21621-on-v3.5.x

Backport PR matplotlib#21621 on branch v3.5.x (Fix GhostScript error handling types)

…t-of-pr-21501-on-v3.5.x

Backport PR matplotlib#21501 on branch v3.5.x (Refix for pyparsing compat.)

…rt 1

…t-of-pr-21604-on-v3.5.x

Backport PR matplotlib#21604 on branch v3.5.x (Fix centre square rectangle selector part 1)

…t-of-pr-21640-on-v3.5.x

Backport PR matplotlib#21640 on branch v3.5.x (DOC: remove sample_plots from tutorials)

…t-of-pr-21628-on-v3.5.x

Backport PR matplotlib#21628 on branch v3.5.x (Fix METH_VARARGS method signatures )

Highlights of this release include:

- Figure and Axes creation / management
    - subplot_mosaic supports simple Axes sharing
    - Figure now has draw_without_rendering method
    - Figure __init__ passes keyword arguments through to set
- Plotting methods
    - Add Annulus patch
    - set_data method for FancyArrow patch
    - New arrow styles in ArrowStyle and ConnectionPatch
    - Setting collection offset transform after initialization
- Colors and colormaps
    - Colormap registry (experimental)
    - Image interpolation now possible at RGBA stage
    - imshow supports half-float arrays
    - A callback registry has been added to Normalize objects
- Titles, ticks, and labels
    - Settings tick positions and labels simultaneously in set_ticks
- Fonts and Text
    - Triple and quadruple dot mathtext accents
    - Font properties of legend title are configurable
    - Text and TextBox parse_math option
    - Text can be positioned inside TextBox widget
    - Simplified font setting for usetex mode
    - Type 42 subsetting is now enabled for PDF/PS backends
- rcParams improvements
    - Allow setting default legend labelcolor globally
- 3D Axes improvements
    - Axes3D now allows manual control of draw order
    - Allow changing the vertical axis in 3d plots
    - plot_surface supports masked arrays and NaNs
    - 3D plotting methods support data keyword argument
- Interactive tool improvements
    - Colorbars now have pan and zoom functionality
    - Updated appearance of Slider widgets
    - Selector additions of clearing, dragging, and removal
    - CallbackRegistry objects gain a method to temporarily block signals
    - Directional sizing cursors
- Sphinx extensions
    - More configuration of mathmpl sphinx extension
- Backend-specific improvements
    - New GTK4 backend
    - New Qt6 backend
    - HiDPI support in Cairo-based, GTK, and Tk backends
    - Qt figure options editor improvements
    - WX backends support mouse navigation buttons
    - WebAgg uses asyncio instead of Tornado

So the tarballs from GitHub are stable.

… made Deprecation Process clearer

…t-of-pr-21626-on-v3.5.x

Backport PR matplotlib#21626 on branch v3.5.x (Added the definition of Deprecation and made Deprecation Process clearer)

This also reverts matplotlib#21550, which was not intended to be part of 3.6.