Improvements

[flabbet]

cached recovered documents, changed wording and fixed shared toolbar setting once again

• Round opacity
• Pasting an image clears selection but undoing doesn't restore it
• Merging layers doesn't register as a change (no asterisk next to filename)
• Using the scroll wheel on the opacity field changes the text but not the opacity
• Quick usage doesn't work for pipette #384
• Alt color picker
• Viewport and shortcuts focus fixes

[CPKreu]

Didn't fix #357 for me, maybe we should add an popup displaying errors when recovering documents
And maybe wording might be recoverable in crash dialog would be better

[Equbuxu]

• The collapse button of the reference layer is still focusable, the same goes for:
  • The swap colors button inside of the color picker, not sure if this can be fixed without
    changing the color picker.
  • HEX/RGBA and background buttons of the navigator window
  • The close layer button
  • The pen mode button
• Layer opacity undo breaks after using the scroll wheel (actually maybe in general too)
  1. Make a new document
  2. Scroll down above the opacity field
  3. Hold down undo
  4. It cycles between two values instead of going back up to 100
• Pasting an image does strange things when the image is bigger than the canvas
  1. Copy a 64x64 image
  2. Paste it on a 16x16 canvas
  3. The image gets cropped and now you've got a big highlight
• Exception when loading recovered files even though the files aren't corrupted
  1. Download crash-2022-03-04_02-39-31_420.zip
  2. PixiEditor Project Properties -> Debug -> General -> Open debug launch profiles UI -> Command line arguments -> Set to -- crash "pathtofile"
  3. Launch and recover files to see an exception (ViewModelMain.Current is null)
• PixiEditor fails to load recovered files even though they were successfully saved #357 still isn't fixed, but I fixed it in Changed stream reading to always read all bytes PixiParser#14. Once it is merged we'll need to update the package

[flabbet]

I didn't fix Exception when loading recovered files even though the files aren't corrupted. Also focus on ColorPicker is still there. It can be done probably using ControlTemplate. But I left it for now

[Equbuxu]

• The close *tab* button (I've called it the "close layer button" by mistake last time) is still focusable.
• I'd argue that the fix to Preserve aspect ratio doesn't work like it supposed to  #337 also broke the preserve aspect ratio function in the resize image/canvas dialogs, cause there I would expect them to always use the canvas proportions, not the stuff you've typed

[Equbuxu]

I found another case where undoing pasting doesn't bring selection back but I decided to make it into an issue (#394). I've also made an issue for recovering files after crash (#393). I think we should merge this PR and make a dev release