feat: defaults: set undo points in <C-U> and <C-W> (#15400)

runtime/doc/insert.txt

@@ -68,12 +68,18 @@ CTRL-A		Insert previously inserted text.
 CTRL-W		Delete the word before the cursor (see |i_backspacing| about
 		joining lines).  See the section "word motions",
 		|word-motions|, for the definition of a word.
+						*i_CTRL-W-default*
+		By default, sets a new undo point before deleting.
+		|default-mappings|
 						*i_CTRL-U*
 CTRL-U		Delete all entered characters before the cursor in the current
 		line.  If there are no newly entered characters and
 		'backspace' is not empty, delete all characters before the
 		cursor in the current line.
 		See |i_backspacing| about joining lines.
+						*i_CTRL-U-default*
+		By default, sets a new undo point before deleting.
+		|default-mappings|
 						*i_CTRL-I* *i_<Tab>* *i_Tab*
 <Tab> or CTRL-I Insert a tab.  If the 'expandtab' option is on, the
 		equivalent number of spaces is inserted (use CTRL-V <Tab> to

runtime/doc/vim_diff.txt

@@ -78,6 +78,8 @@ Default Mappings:					*default-mappings*
 
 nnoremap Y y$
 nnoremap <C-L> <Cmd>nohlsearch<Bar>diffupdate<CR><C-L>
+inoremap <C-U> <C-G>u<C-U>
+inoremap <C-W> <C-G>u<C-W>
 
 ==============================================================================
 3. New Features						       *nvim-features*

src/nvim/getchar.c

@@ -841,6 +841,14 @@ static void init_typebuf(void)
   }
 }
 
+void init_default_mappings(void)
+{
+  add_map((char_u *)"Y y$", NORMAL, true);
+  add_map((char_u *)"<C-L> <Cmd>nohlsearch<Bar>diffupdate<CR><C-L>", NORMAL, true);
+  add_map((char_u *)"<C-U> <C-G>u<C-U>", INSERT, true);
+  add_map((char_u *)"<C-W> <C-G>u<C-W>", INSERT, true);
+}
+
 // Insert a string in position 'offset' in the typeahead buffer (for "@r"
 // and ":normal" command, vgetorpeek() and check_termcode())
 //

src/nvim/normal.c

@@ -397,12 +397,6 @@ void init_normal_cmds(void)
   nv_max_linear = i - 1;
 }
 
-void init_default_mappings(void)
-{
-  add_map((char_u *)"Y y$", NORMAL, true);
-  add_map((char_u *)"<C-L> <Cmd>nohlsearch<Bar>diffupdate<CR><C-L>", NORMAL, true);
-}
-
 /*
  * Search for a command in the commands table.
  * Returns -1 for invalid command.

src/nvim/testdir/setup.vim

@@ -27,6 +27,8 @@ set switchbuf=
 " Unmap Nvim default mappings.
 unmap Y
 unmap <C-L>
+iunmap <C-U>
+iunmap <C-W>
 
 " Prevent Nvim log from writing to stderr.
 let $NVIM_LOG_FILE = exists($NVIM_LOG_FILE) ? $NVIM_LOG_FILE : 'Xnvim.log'

test/functional/helpers.lua

@@ -44,6 +44,8 @@ module.nvim_argv = {
   '--cmd', module.nvim_set,
   '--cmd', 'unmap Y',
   '--cmd', 'unmap <C-L>',
+  '--cmd', 'iunmap <C-U>',
+  '--cmd', 'iunmap <C-W>',
   '--embed'}
 
 -- Directory containing nvim.