feat(defaults): disable 'foldcolumn' in terminal buffers (#31480)

runtime/doc/news.txt

@@ -58,8 +58,8 @@ DEFAULTS
 • |]d-default| and |[d-default| accept a count.
 • |[D-default| and |]D-default| jump to the first and last diagnostic in the
   current buffer, respectively.
-• 'number', 'relativenumber', and 'signcolumn' are disabled in |terminal|
-  buffers. See |terminal-config| for an example of changing these defaults.
+• 'number', 'relativenumber', 'signcolumn', and 'foldcolumn' are disabled in
+  |terminal| buffers. See |terminal-config| for an example of changing these defaults.
 
 DIAGNOSTICS
 

runtime/doc/terminal.txt

@@ -111,6 +111,7 @@ global configuration.
 - 'number' is disabled
 - 'relativenumber' is disabled
 - 'signcolumn' is set to "no"
+- 'foldcolumn' is set to "0"
 
 You can change the defaults with a TermOpen autocommand: >vim
     au TermOpen * setlocal list

runtime/doc/vim_diff.txt

@@ -189,6 +189,7 @@ nvim_terminal:
     - 'nonumber'
     - 'norelativenumber'
     - 'signcolumn' set to "no"
+    - 'foldcolumn' set to "0"
     - 'winhighlight' uses |hl-StatusLineTerm| and |hl-StatusLineTermNC| in
       place of |hl-StatusLine| and |hl-StatusLineNC|
 

runtime/lua/vim/_defaults.lua

@@ -495,6 +495,7 @@ do
       vim.wo[0][0].number = false
       vim.wo[0][0].relativenumber = false
       vim.wo[0][0].signcolumn = 'no'
+      vim.wo[0][0].foldcolumn = '0'
 
       -- This is gross. Proper list options support when?
       local winhl = vim.o.winhighlight