• Get it working for VectorSourceEstimates (added in WIP: Use _Brain in plot_vector_source_estimates #7060)
• Improve the color cycle of point picking to allow point color re-use (MRG, ENH: Allow color reuse in clicking #7516)
• Check that the latest version 0.24 of pyvista is used (added in Check pyvista version in _TimeViewer #7506)
• Put time_viewer='auto' and show_traces='auto' as the default for stc.plot / plot_source_estimates (added in WIP: Set time_viewer and show_traces to auto #7380)
• Use the latest version 0.24 of pyvista (added in WIP: Prepare _TimeViewer for next version of pyvista #7458)
• Use interpolation nearest as the default (suggested in MRG: Enable point picking in _TimeViewer #7247 (comment), added in MRG: Add toggle to save_movie in _TimeViewer #7257, reverted in 95ad0ee, added in MRG, FIX: Fix for singleton and efficiency #7469)
• Improve performance of interpolation (added in MRG: Add toggle to save_movie in _TimeViewer #7257, reverted in 95ad0ee, added in MRG, FIX: Fix for singleton and efficiency #7469)
• Display current time with a line in MplCanvas (suggested in MRG: Enable point picking in _TimeViewer #7247 (comment), added in MRG: Link _TimeViewer time slider with vertical time line #7423)
• Link the time plot of MplCanvas with the time slider (suggested in MRG: Enable point picking in _TimeViewer #7247 (comment), added in MRG: Link _TimeViewer time slider with vertical time line #7423)
• Add a way to clear all the added points in show_traces=True mode (added in Add clear_points in _TimeViewer #7386)

• Set PyVista as the default 3d backend (done in MRG: Set pyvista as default 3d backend #8220)
• Add reset key that resets camera all views and time to what they were at the beginning / viz init (suggested in MRG, ENH: Add flatmap #8082 (comment), done in MRG: Reset the viz settings in _TimeViewer #8125)
• Link brains picking infos (suggested in Feat Requests: pyvista - Brain/timeviewer #7959, done in MRG: Link picking informations in _LinkViewer #8112)
• Link brains colorbar (suggested in MRG: Link brains with _LinkViewer and plot_linked_brains #7227 (comment), done in MRG: Link colorbar controls in _LinkViewer #8126)
• Link brains camera (suggested in Feat Requests: pyvista - Brain/timeviewer #7959, done in MRG: Link cameras in _LinkViewer #7962)
• Remove _MNE_BRAIN_TRACES_AUTO=false and build the frontpage after MRG, ENH: Scrape traces when available #7927 and MRG: Prepare migration to PyVista 0.25 #7791 (suggested in MRG: TimeViewer matplotlib figure color #7925 (comment); in progress in MRG, ENH: Scrape traces when available #7927)
• Scrape traces (done in MRG, ENH: Scrape traces when available #7927)
• Get picking infos with get_picked_points() (suggested in Feat Requests: pyvista - Brain/timeviewer #7959, done in MRG: Add get_picked_points() to _Brain #7963)
• Add remove_labels (suggested in Feat Requests: pyvista - Brain/timeviewer #7959, done in MRG: Add remove_labels to _Brain #7964)
• Add support for pinch-to-zoom (suggested in ENH: New interface for Brain #7162 (comment); done in ENH: Add pinch-to-zoom pyvista/pyvistaqt#26)
• Fix sizing when TimeViewer is present (added in MRG, ENH: Add resizing when time_viewer is present #7775)
• Add mne.surface in the public_modules (suggested in FIX,VIZ: Update read_curvature #7289 (comment), added in MAINT: Add mne.surface to docstring tests #7930)
• Make the internal matplotlib figure to match foreground/background colors with the render view (suggested in MRG: Add support for foreground in _Brain #7843 (comment); done in MRG: TimeViewer matplotlib figure color #7925)
• Remove PySurfer from CircleCI (probably after changing plot_parcellation.py to just iterate over labels, see MRG, MAINT: Remove PySurfer from CircleCI #7275, added in MRG: _Brain add_annotation #7659, MRG: Refactor _get_ps_kwarg #7695, WIP: Pip uninstall mayavi and pysurfer from CircleCI #7702)
• Improve toolbar icon consistency and resolution (suggested in MRG: TimeViewer save movie #7612 (comment), added in MRG: Improve toolbar icon consistency #7698)
• Use button widgets (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), merged upstream, proof of concept in MRG: Add support for playback in time_viewer #7200, limitations encountered in MRG: Add support for playback in time_viewer #7200 (comment)) or vtkPlaybackWidget for Play/Pause control of the playback, added in WIP: Time viewer tool bar with SVG icons #7589)
• Add a way to create a movie/GIF (added in MRG: Add toggle to save_movie in _TimeViewer #7257, reverted in 95ad0ee, added in MRG: Brain save movie #7574)
• Update latest.inc and plot_visualize_stc to mention save_movie() (suggested in MRG: Add toggle to save_movie in _TimeViewer #7257 (review), added in MRG: Add toggle to save_movie in _TimeViewer #7257, reverted in 95ad0ee, added in in MRG: Brain save movie #7574)
• Use a progress bar during movie saving (suggested in MRG: Add toggle to save_movie in _TimeViewer #7257 (comment), added in MRG: Add toggle to save_movie in _TimeViewer #7257, reverted in 95ad0ee, added in MRG: TimeViewer save movie #7612)
• Improve performance by using directly the widget representation instead of widget name or use pass_widget option to widget callback (added in MRG: Link brains with _LinkViewer and plot_linked_brains #7227)

• Fix colorbar representation with transparent=True, should alpha blend fmin->fmid with brain_color (added in FIX: scalar_bar #8643)
• Fix memory problems (WIP: Decrease Brain memory consumption #8399, MRG, ENH: Fix memory on CircleCI #8379, MNT: use brain_gc fixture in some tests #8427, MNT: Add brain_gc fixture to test_process_clim_plot #8575)
• Merge "_TimeViewer" with _Brain (added in WIP: Merge time viewer code into Brain #8352)

• Get jupyter notebook integration working properly with multi-views and time course plotting/clicking (partially solved by WIP: Prototype of notebook viz (screencast) #7758, added in in MRG: Prototype of notebook viz (ipyvtk) #8503)
• Add brain silhouette (added in MRG: Brain silhouette #8771)
• Add better intructions to integrate in Report (added in MRG: support plot_stc in report #8730)
• Add shorcuts to rotate the camera and shift time (added in MRG: Improve Brain UX #8792)
• Widget migration from VTK to Qt/Jupyter Widgets (added in MNT: Migrate VTK Widgets to GUI API #8862)
• Light/Dark theme switcher (suggested in WIP, ENH: Button to change the background color #9000 (comment), added in Dark-mode to PyVista-Brain (pair-programmed with @GuillaumeFavelier) #9149)

• add a color parameter to add_sensors() to set channels color (suggested in mne.discourse.group)
• Interactive sensor-level field patterns browser (suggested in interactive sensor-level field patterns browser #8382 (comment), work in progress in WIP, ENH: Add sensors to Brain #8803)
• Interface for drawing ROIs using the mouse
• Move the vertexId/MNI from the legend to the status bar (suggested in MRG: Improve Brain UX #8792 (comment))
• Fix ctrl-C pressing during generation of movies -- should abort generation, currently sometimes just stops a given VTK render (caught by vtkRenderWindowInteractor) sometimes stops the screenshot generation at our end but still saves a movie, etc.
• Fix multi-window memory problems (BUG: VTK/PyVista not freeing memory with multiple figures #8241, MRG, MAINT: Deprecated param and pytest-qt #8808), macos failures (FIX: vertices #8611 (comment), MAINT: Skip bad macOS test #8619)
• Change the theme with QEvent.PaletteChange (suggested in Automatic light/dark mode switching of open STC plot windows #9182)
• Add support for shadows (suggested in ENH: New interface for Brain #7162 (comment))

• Unnecessary updates of Brain (reported in BUG: Possible inefficient updates to Brain #8986; fixed in Reduce pyvista viz test time #8246)
• Reduce pyvista viz test time (suggested in MRG: Speedup testing of _Brain #7726 (comment), MAINT: Tests taking too long #8242; done in Reduce pyvista viz test time #8246)
• Lower the CPU usage (done in Update _TimeViewer's plotter only when necessary #7517)
• Refresh slider style (done in MRG: Change _TimeViewer slider style #7509)
• Avoid the confusion between the default pyvista cell picking and the in _TimeViewer (suggested in MRG: Enable point picking in _TimeViewer #7247 (comment))
• Vertex picking -> time course (suggested in picking vertex in brain object to see time course #7235, added in MRG: Enable point picking in _TimeViewer #7247)
• Tag a stable version of PyVista to use with _TimeViewer (added in Use latest version 0.23.1 of pyvista instead of master #7318))
• Add a legend/help (suggested in ENH: Add pop-up key mapping for PyVista stc.plot #7268 (comment), added in WIP: Add help window to the _TimeViewer #7305)
• Switch from time_actor to time_slider_title to allow scaling with the window (added in MRG: Update time slider label #7263)
• Use a contextmanager for tests using widgets (suggested in MRG: Refactor OFF_SCREEN variable #7276 (comment), added in MRG, MAINT: Use context manager for tests #7280)
• Improve documentation about hemi (suggested in stc.plot with pyvista: error with hemi='both' #7250 (comment), added in MRG: Update stc.plot documentation about hemi #7256)
• Allow fmin, fmid, and fmax to take on all data values, and bump the scalar range while interacting with the slider as necessary (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in MRG: Bump colorbar control points #7188)
• Add a fscale slider (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in 068654f)
• Add support for smoothing=nearest (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in MRG: Add support for smoothing_steps=0 #7191)
• Use vertical orientation for the scalarbar (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in 3bbc6c2)
• Use text slider widget (merged upstream, added in MRG: Use a text slider widget #7186)
• Use PySurfer-like time dilation (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in MRG: Add support for playback in time_viewer #7200)
• Bring colorbar values auto-scaling (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in MRG: Add support for auto_scaling in time_viewer #7218, fixed in FIX: Fix actor getting fetched from hemi data #7226)
• Add support for hemi=split (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in MRG: Add support for hemi=split in time_viewer #7219)
• Link brains timeline (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), added in MRG: Link brains with _LinkViewer and plot_linked_brains #7227)

• The window title bar does not follow the theme (reported in Automatic light/dark mode switching of open STC plot windows #9182)
• Unexpected behaviour with shortcuts (reported in MRG: Improve Brain UX #8792 (comment))
• The main window opens in the background in jupyter qtconsole (reported in WIP: Add help window to the _TimeViewer #7305 (comment), ENH: New interface for Brain #7162 (comment))
• Detect no-opengl to avoid crash (reported in Kernel appears to have crashed with mne.viz #9333, fixed in ENH: Sandbox the GPU info request pyvista/pyvista#2250)
• Fix off-by-one in screenshot(time_viewer=True) (reported in brain.screenshot(time_viewer=True) crash #9336, BUG: Fix concat on Windows #9351)
• Flatmap are not compatible with hemi=both (reported in BUG: flat map with "both" on top of one another #9306, MRG, BUG: Fix positioning of flatmaps #9315)
• Unify sliders and combo boxes to use period instead of comma (reported in WIP,ENH: Load Qt stylesheet #9126 (comment), fixed in FIX: Brain locale #9179)
• Wrong color with add_label (reported in color argument is not respected in brain.add_label #8815 (comment), fixed in MRG, FIX: Brain add/remove labels #8820)
• There are visual artifacts on overlapping surfaces on the brain (reported in BUG: Bugs with VTK 9 #7599, fixed in MRG: Use overlay compositing #8576)
• The camera is reset too often causing the brain to "bounce" (fixed by FIX: reset_camera #8572)
• The glyphs colormap are not updated interactively (reported in MRG: Add support for foreground in _Brain #7843 (comment); done in MRG, BUG: Fix vector scaling #7934)
• The parameter foreground is not supported in _Brain (reported in Pyvista foreground bug #7842; done in MRG: Add support for foreground in _Brain #7843)
• There is an unnecessary window title decoration bar on macOS (reported in Remove window title decoration from new _TimeViewer #7316)
• The focalpoint when hemi=both should be between the hemispheres (suggested in MRG: Enable point picking in _TimeViewer #7247 (comment), added in MRG: Add reset_camera() primitive in _Renderer #7390)
• The title parameter is not taken into account (reported in ENH: New interface for Brain #7162 (comment), fixed in Fix window name in _TimeViewer #7382 and MRG: Set _Brain window title #7396)
• The slider handles when hemi=both overlap (reported in MRG: Enable point picking in _TimeViewer #7247 (comment), fixed in Fix orientation slider when hemi=both #7383)
• The initial_time is not taken into account (reported in stc.plot setting initial_time not working with time_viewer=True (PyVista) #7379 added in Fix initial_time in _TimeViewer #7381)
• dorsal view causes the _Brain object to disappear (reported in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), fixed in MRG: Correct camera view_up when necessary #7187)
• The colorbar labels are not updated when the range is modified (fixed in a70b992)

• Use slider with multiple handles (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment) and MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), prototype available on gist)
• Improve help window UX (suggested in WIP: Add help window to the _TimeViewer #7305 (comment))
• Put label of the orientation slider above the bar (suggested in MRG: Use _TimeViewer in plot_source_estimates #7153 (comment), prototype available on WIP: Add text above orientation slider #7211)

From #7153 (comment):

From plot_visualize_stc.py: