= Global Top-Bar - Initial Implementation
This adds the initial implementation of the new global top-bar, as decided on during the 2.8 UI workshop (see https://wiki.blender.org/index.php/Dev:2.8/UI/Workshop_Writeup#Global_Bars).
== Main Features/Changes for Users
* Add horizontal bar at top of all non-temp windows, consisting out of two horizontal sub-bars.
* Upper sub-bar contains global menus (File, Edit, etc.), tabs for workspaces, render engine and scene selector.
* Lower sub-bar contains object mode selector, operator redo buttons, screen-layout and render-layer selector.
* Individual sections of the topbar are individually scrollable
* Workspace tabs can be double- or ctrl-clicked for renaming
* Top Bar should scale nicely with DPI
{F685615}
== Technical Features/Changes
* Support for global areas (horizontal-only for now). They are part of the window, not part of the screen-layout.
* Removes all info editors when reading old files, they'll get an entirely new purpose
* New space-type "Top Bar". Shouldn't be selectabe through menu (TODO)
== TODO
Feature-wise:
* Split operator settings into basic and advanced settings. (D2883)
* ~~Add "More" button to top-bar for advanced operator settings.~~
* Show buttons for operator settings while using modal operators.
* Add a way to hide the top-bar (needs discussion on if we want this and how it should work).
* ~~Add a way to delete workspaces from tabs (not directly topbar related but should be done for merge).~~
* Polish operator settings buttons (better grouping, better spacing, etc).
* Increase height of second bar to distinguish from headers.
Code-wise:
* Disallow changing editors into topbar through UI (hide from menu) and Python.
* Solve context issues with operator settings (e.g. changing settings after translate prints errors to console).
* Integrate layout based regions (regions that auto resize to content bounds) a bit nicer.
* Fix glitches with HiDPI screens. (Might be fixed now, needs confirmation)
* Some general fixes & cleanup.