Why to develop scale cage with points if these points not working, eg. can't be handled by mouse, etc.?
Now the not working things aroung GUI are as features?

How I thinking about external files..
Well.. some of user trying use git for blender, eg. blendgit: https://github.com/ldo/blendgit (not working with b.2.92)
When we have .blend files with materials, etc. then .blend file is hudge (eg. 200MB when without is about 1MB), hard to saving this type as a1.blend a2.blend a3.blend, etc. (growing 200+200+200+200)
My idea was to to have ANY_object.blend in ANY_scene.blend where in ANY_scene.blend have materials, etc. that painting ANY_object.blend in case we can have many versions ANY_object_1.blend ANY_object_2.blend etc. but linked is always saved as ANY_object.blend and from this files all is conected to other.
Of course can have ANY_scene_1.blend ANY_scene_2.blend as other version, but for comfy work the main can be ANY_scene.blend in case does'nt mater the final.
For some reason should exist option to do "Append all linked" files, assets etc. eg. for remote rendering, etc. And maybe in diferent may as Subtract or Exclude some object to external files like export this assets.

This can be "married" with "Revert" (revert_mainfile) in way, that blender checking time of last file edit, and user can select linked files as components that can be updated.
Feature around this offering something like versioning and option for collab where some users can work with parts (like Autodesk part/assebmlies) as components.
To increase functionality, .blend can offer some higher history to back version as saved in file, to select version - https://blender.community/c/rightclickselect/qhhbbc/ History of events on viewport or other actions on GUI
Revert should be more like "Refresh".

https://blender.community/c/rightclickselect/Kghbbc/#608c4b4b9c122129ebc1dd54 More Explanations
https://blender.community/c/rightclickselect/nnhbbc/ Parent for objects - new functions

or it's related with "attack"?
https://code.blender.org/

@Robert Guetzkow (rjg) yes, it was deffender issue for files and blender.

Take stron attention for outliner hierarchy and lables on viewport to understand optimized hierarchy and relations + option to operate by names (D&D) on outliner

@ dev
You can read here more info about problems, where conclusion is about not intuitive solution around Collections.
https://blender.community/c/rightclickselect/Kghbbc/#604c0aa69c1221506a8c36ce Working with external files as components (This is very important)
Main conclusion is about Collections position in outline like "dir" not object. Next lack of function like "unJoin" or "Explode" for Join without destroy for names of ojbects and hierarchy of this.

HVR.. in positive of effect this issue.. reflection is that Blender should ask about overwrite file if names are this same maybe.. red input is just alert, but easy to ommit in some issues.

Ok some misunderstandig.. coz was sure Save Screenshot is one and this bug track is not for addons. But some progress here. Looks is not Blender problem and issue can be closed probably.

> Are you using an add-on to take and save screen captures?

Just take point
"C:\\Users\\userx\\Pictures\\"
"C:\\Users\\userx\\Obrazy\\

I'm on position that Collection is not needed, whole functions should be implemented as "Component" with hierarchy of objecst as cube, cylinder, etc.
Or Collection as list of whole object as mode without hierarchy in component. Then "Collection of all objects" (I mind sorting object without grouping/parenting or realtions with this for outliner).
But.. after time Collections can have sense in Linked or Append to import Components from Collections and more easy manage this. But instance of Collections is bad, and editable Components is berher way. Or.. Collection can be like mode not editable bu repeated on sene.

Next bug is, when we clicking in outliner by RCM on Colection to do Duplicate Linked, the Colection2 no reacting from Colection.

Want explain this more..
Eg. when we have object like Cube, and this Cube is in some colection, then when we coping colection this not react on viewport scene in right way. We don't see diferences, eg. we must hide collection2 to move, and turn back to visible collection1.
Eg. when want modify deph linked object, eg. add Cylinder to Cube, then must do this in Modeling Edit mode, not Layout. And when I made this in layout hard to move this to linked object. Added object in edit mode liek Cube/etc.. should list on outliner this new object.
Should exist option to move Cylinder in outline window to linked cubes as Component. In other way any object that we adding is outgruped and not related in GUI, even we doing join, then hard to recoginzes these joints too, as some group (this is bad fault for UX disonanse). Join should build Component that in hierarchy have objects.
If I coping some Colection1 with cubes, and changing names of cubes in Colection2 then names should changes in both as Colection1 and Colection2, but maybe not in Colection1 and Colection2 but in Component1 and Componet2.
Hvr Sketchup solved changes as separated not related to give option for Component as "Unique" atribute, and Componets can be in other Component and this is good pratice to manage this all.

To attention the add-on that offering import .skp files, but blocking recognize components and working with them in blender like in sketchup
https://github.com/arindam-m/pyslapi

Create Componet is like "empty" space/instance or collection, where I can Add other opject

BTW.. Live Edit is in state Todo. that not helping development process, and the logs not updating everytime (need click on GUI info).
https://docs.blender.org/manual/en/latest/editors/text_editor.html

Exist id_name as bl_idname and lenss was as example next to "test.test_x" as var

As I wrote "This same on b2.81".

blender-2.80-168d3fd528c4-win64 - to this ver no any changes.

blender-2.80-07765499abee-win64 - some changes,
When moving mouse on vievport near to the icons (on left) in 1/4 part of screen then blinking, on the rest of 3/4 not bliniking. Changes on axis etc.. this same. On top menu (stil transparent and other defects), right inputs fields, blinking.

You are right probably about usfeul symlinks.

blender-2.80-3d8cbb534f82-win64 - no changes

Yes, other/older/previous version blender working ok, and similary other 3d/cad/cam software, etc.

blender-2.80-cfa1700-win64-vc14 looks repaired something coz working now without any changes.