Porting PixiEditor to AvaloniaUI Framework

[flabbet]

PixiEditor is undergoing massive changes, due to porting to other UI framework - AvaloniaUI.

TODO:

Top priority

• Closing last tab doesn't null the document
• Drawing cursor is arrow
• News images doesn't work in build
• Missing Feather icons (X in recent files, news)
• Saving error (mando)
• Drag drop files onto empty viewport
• Fix not being able to grab scrollbar when it's next to the window border (e.g. Hello there window)
• Pen mode icon
• Fingers support (improve controls, two fingers = viewport manipulation tools)
• Digital pen support
• Supporter pack
• Shortcut focus is sometimes lost? (repro needed)
• Make it work on linux
• Preview is blurred in tab/sometimes previews are corrupted
• Loading Window
• Remove old PixiEditor project and rename PixiEditor.AvaloniaUI to PixiEditor
• Updater
• Azure pipelines
• Publish pixidock as a package
• Open any registered dockable menu items
• Colors in action diplay
• Reference layer above scene fix
• Scrolling zoombox doesn't work when overlay is active
• Crash when playing around number text boxes
• Save marker
• Context menu lagging
• Context menu palette picker
• Name isn't updating in tab
• Clicking away from texbox shouldn't focus next
• No crash report
• Test add palette from swatches
• Changing active document doesn't work
• Paste copied image from clipboard doesn't work (commands)
• Compact palette picker
• Rotating selected area is fucked up for some angles
• Color sliders tab
• Tab document preview gets corrupted when size is changed
• Fix viewport resize document
• Fix viewport resize render scene bug
• Render tiled background inside scene
• Brightness tool size doesn't work
• Color picker reference layer fades

Should be done for 2.0, but not urgent

• Saving floating dockables
• Hide news button
• Caret position on editable textblock is wrong
• Recent file animation
• Flashing desktop
• Treat layer like objects
• Host window caption buttons styling
• Extension dockables
• Style key picker in settings
• Color sliders tab icon
• Host window titles/icons, taskbar stuff
• Search control styling and polish
• Palette browser styling
• Scrolling on SizeInput only has an effect on the TextBox part, while the separator and unit part are ignored
• The SizeInput also appears to be behaving generally weird when scrolling, especially when holding modifier keys
• Missing icons (feather, exit, etc)
• Don't close app on escape
• Context menu style
• Changing Color looks weird
• Old logo
• Make context menu work better
• Lottie animation - loading
• Scaling of tabs
• Changing size of the image leaves symmetry handles in old position

Minor

• Context menu is not rounded
• Default file size uneven widths of fields
• Layers have a border that shows the bounds
• Layer Opacity checkbox is too smol and overflows
• Pick file in color paltte filter names are wrong
• Open reference set All images as default explorer option
• Checker background isn't 1:1 with image (bleeds a pixel ouside)
• No size cursor for shapes
• Visual focus adorner in popups are not working
• Some buttons animate weirdly on hover (close on document tab for example)

Nice to have features

• Themes
• Add ability to dock next to a vertical or horizontal stack of dockables
• Add support for moving when folder is selected
• Fallback view for document pane
• Load/Save layouts
• Side panel for dock (optional)
• Select a layer by default on load pixi file
• Changing settings during transformation (fill color while creating shape)
• Move tool ux changes (select object bounds by default)