Hi all,
  After hours of frustration ending in a realization that I should really
just read the change logs, I tracked down the reason why editing
source blocks was now destroying my window layout. I restored the
old behavior hidden behind a custom variable. Let me know if it looks
ok, or if more work is needed. Thanks!
From 362a45ff172af3f49050964aa8534d11374934ca Mon Sep 17 00:00:00 2001
From: Tom Gillespie <tgb...@gmail.com>
Date: Sun, 16 Feb 2020 19:21:16 -0800
Subject: [PATCH] org-src: Add option to restore window configuration after

* lisp/org-src.el: Add an option to restore the previous window
configuration after exiting from editing a source block. The variable
is called `org-src-window-restore' and is only relevant when
`org-src-window-setup' is set to `reorganize-frame'.

This commit retains the default behavior in version 9.3 while
restoring the old behavior behind a custom variable, it
effectively reverts 819e98afd018cad3c13fd58bfcbd979ab36dfbc7
and adds an option to reenable the old behavior.
 lisp/org-src.el | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/lisp/org-src.el b/lisp/org-src.el
index 7876deaba..f8f236ebd 100644
--- a/lisp/org-src.el
+++ b/lisp/org-src.el
@@ -169,6 +169,12 @@ other-frame        Use `switch-to-buffer-other-frame' to display edit buffer.
 	  (const other-window)
 	  (const reorganize-frame)))
+(defcustom org-src-window-restore nil
+  "Non-nil means that org mode will restore the layout of the windows
+that was present before the org-src window was initially opened. This
+option is only involved if `org-src-window-setup' is set to
 (defvar org-src-mode-hook nil
   "Hook run after Org switched a source code snippet to its Emacs mode.
@@ -276,6 +282,9 @@ issued in the language major mode buffer."
 (defvar-local org-src--remote nil)
 (put 'org-src--remote 'permanent-local t)
+(defvar-local org-src--saved-temp-window-config nil)
+(put 'org-src--saved-temp-window-config 'permanent-local t)
 (defvar-local org-src--source-type nil
   "Type of element being edited, as a symbol.")
 (put 'org-src--source-type 'permanent-local t)
@@ -469,6 +478,9 @@ When REMOTE is non-nil, do not try to preserve point or mark when
 moving from the edit area to the source.
 Leave point in edit buffer."
+  (when (and (eq org-src-window-setup 'reorganize-frame)
+	     org-src-window-restore)
+    (setq org-src--saved-temp-window-config (current-window-configuration)))
   (let* ((area (org-src--contents-area datum))
 	 (beg (copy-marker (nth 0 area)))
 	 (end (copy-marker (nth 1 area) t))
@@ -1182,7 +1194,12 @@ Throw an error if there is no such buffer."
        (write-back (org-src--goto-coordinates coordinates beg end))))
     ;; Clean up left-over markers and restore window configuration.
     (set-marker beg nil)
-    (set-marker end nil)))
+    (set-marker end nil)
+  (when (and (eq org-src-window-setup 'reorganize-frame)
+	     org-src-window-restore
+	     org-src--saved-temp-window-config)
+    (set-window-configuration org-src--saved-temp-window-config)
+    (setq org-src--saved-temp-window-config nil))))
 (provide 'org-src)

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