Flexible Project Document Window - Similar to CSP/SAI/PS

[crse]

Made an updated feature request to reflect existing feature set of Krita

Unified Subwindows and Tab [multiple document mode]

Why subwindows and tab on multiple document mode needs to be unified? Unifying both system will help user to have more flexibility on their preferred way to work and/or display their document instantly without having to choose subwindows or tab. It also helps new user from other software like CSP or Photoshop easier time on Krita, easier to figure out how to manage their document window. Details on how CSP implement their document window management: [oZ67CKWTBr] [f3AJHJAPGb] Feature spec…