[WIP] GLES2 error: initialize: Directional shadow framebuffer status invalid on macOS

[follower]

{ [WIP Report] See: #26570 for original details. Created issue as requested in #31259 (comment) }

Godot version: v3.1.2-rc1_osx.64

OS/device including version: Mac

Issue description:

The shadows in the editor & application are incorrect and display "garbage" which seems like uninitialized memory--and changes over time.

When the application is run the following error is displayed in Error console:

E 0:00:00:0266   Directional shadow framebuffer status invalid
  <C Source>     drivers/gles2/rasterizer_scene_gles2.cpp:3378 @ initialize()

• Incorrect shadows in editor:

• Incorrect shadows in application:

Steps to reproduce:

[TODO]

Minimal reproduction project:

[TODO]

Note:

• This doesn't occur in 3.2 beta 1.

• Updated: Possibly related comment regarding underlying issue: Check for unsigned_short support for gles2 depth buffer allocation #31259 (comment)

[clayjohn]

Looks like #31259 just needs to be cherrypicked.

[akien-mga]

Created issue as requested in #31259 (comment)

What I was referring to is a new issue for the 3.2 branch to cater to @endragor's comment in #31259 (comment).

This WIP report seems to be a duplicate of #26570 which is already fixed? So I'll close as fixed in 3.2, and #31259 already has the cherrypick:3.1 label which identifies it as a candidate for including in the 3.1 branch.