TASKBAR2 ALPHA

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Taskbar2
Taskbar2 is new StartAllBack (partially) recreated taskbar prototype.
It's not a product and is for testing only.
Task buttons:
- Better: ungrouped icons are pixel-perfect if possible
- Different: does not depend on immersive shell / shows faster
- Different: no horizontal 1px padding; no drag&drop to pin to apps
Thumbnails:
- Better: can be rearranged with drag and drop
- Different: list of windows overflows into multiple columns, not scrolling
- Different: animation, Win7 design, Snap Groups / Window sharing / Toolbar design
Alpha Milestone 1 limitations:
- No multi-monitor taskbars
- No perks (centered, segmented ex.)
- Still totally depends on classic taskbar code
Those to be researched later. Expect major degradations or never shipping at all.
Please stay strictly on topic. Do regression testing (compare with existing classic taskbar)
Functionality checklist
Task icons
Enumeration of existing; adding, removing classic/uwp apps; AppID, title, icon task update reflection
Virtual desktop filter toggling / switching
Enumeration of existing pins; pinning via other UI; pinning via drag & drop; unpinning from other UI, jumplist, if shortcut deleted; policy preventing pinned apps
Reordering by dragging: single / multiple rows
Click to activate/minimize; combined button click shows thumbnails
Ctrl+clicking group or LastActiveClick registry key switches between combined button tasks
Shift+clicking button or middle-clicking launches new app instance; ctrl+shift+clicking group launches elevated app elevated
Right-click, dragout: show jump list
Shift+right-click: window system menu or shortcut context menu
Layout: all combinations
Different icon size / padding / screen DPI / metrics
Vertical / horizontal layout on different screen edges
Multiple horizontal rows: filling each visible row with maximum density
Different visible / total rows: scrolling and scrollbar position
Combined/auto-combined/uncombined behavior
Task list extensibility
Overlay icons + badges on uwp apps: grouped/grouped
Progress bar: paused/error/normal/indeterminate; grouped/ungrouped
Window flashing: depends on caret blinking speed
Custom windows added or removed to list; alternate activation windows (Office < 2013?)
Thumbnails
Thumbnails are shown after ExtendedUIHoverTime (default hover time)
Thumbnails are used when there are less than NumThumbnails (16) tasks
Thumbnails are sized according to display aspect ratio no bigger than MaxThumbSizePx (200)
Hover thumbnails should close if any key is pressed
Click to activate window; press-and-move to rearrange
Right-click for system menu
Close with red button or middle-button click
Window tabs (IE? VMWare?): active tab, tab order/switching/thumbnails
Thumbnail toolbars: lot of rarely used behaviors; special media toolbars for UWP apps
Snap groups: activation, closing, group context menu
Window sharing (webex/Teams): not for groups or tabs
Hover for Aero Peek: shows if DisablePreviewWindow(0) is not 0 after ThumbnailLivePreviewHoverTime(250) initial hover
Keyboard:
Win+{number}: same as click with one-window button; switch between tasks while help
Alt+Win+{number}: show jumplist
Shift+Win+{number}: launch new apps instance
Win+(Shift)+T, F6/Tab/keyboard arrows/space/enter: navigate between icons and thumbnails
Accessibility: Narrator / automation
Misc:
Drop file over icon / thumbnail to activate window
Animations: open/close, collapse/expand, hover, launch feedback, added to group, flashing, progress bar, move from icons to thumbnails
Taskbar on virtual desktop switching animation (unfinished)
Fullscreen classic / uwp app behavior
Tooltips

https://msfn.org/board/topic/186208-taskbar2-alpha/