Return back to history-based tabs activation on close (#19150)

Closes https://github.com/zed-industries/zed/issues/19036

Alters https://github.com/zed-industries/zed/pull/18168 and moves its
change behind a settings flag, restoring the previous behavior.

Release Notes:

- Fixed tab closing not respecting history. Use `tabs.activate_on_close
= neighbour` settings to activate near tabs instead.

docs/src/configuring-zed.md

@@ -539,7 +539,8 @@ List of `string` values
 "tabs": {
   "close_position": "right",
   "file_icons": false,
-  "git_status": false
+  "git_status": false,
+  "activate_on_close": "history"
 },
 ```
 
@@ -579,6 +580,30 @@ List of `string` values
 - Setting: `git_status`
 - Default: `false`
 
+### Activate on close
+
+- Description: What to do after closing the current tab.
+- Setting: `activate_on_close`
+- Default: `history`
+
+**Options**
+
+1.  Activate the tab that was open previously:
+
+```json
+{
+  "activate_on_close": "history"
+}
+```
+
+2. Activate the neighbour tab (prefers the right one, if present):
+
+```json
+{
+  "activate_on_close": "neighbour"
+}
+```
+
 ## Editor Toolbar
 
 - Description: Whether or not to show various elements in the editor toolbar.