feat(pack): add [[ and ]] mappings in confirmation buffer

Problem: No easy/robust way to jump between plugin sections.

Solution: Add `[[` and `]]` mappings.

runtime/doc/pack.txt

@@ -393,9 +393,10 @@ update({names}, {opts})                                    *vim.pack.update()*
     • Depending on `force`:
       • If `false`, show confirmation buffer. It lists data about all set to
         update plugins. Pending changes starting with `>` will be applied
-        while the ones starting with `<` will be reverted. It has special
-        in-process LSP server attached to provide more interactive features.
-        Currently supported methods:
+        while the ones starting with `<` will be reverted. It has dedicated
+        buffer-local mappings:
+        • |]]| and |[[| to navigate through plugin sections.
+        Some features are provided via LSP:
         • 'textDocument/documentSymbol' (`gO` via |lsp-defaults| or
           |vim.lsp.buf.document_symbol()|) - show structure of the buffer.
         • 'textDocument/hover' (`K` via |lsp-defaults| or

runtime/ftplugin/nvim-pack.lua

@@ -1,3 +1,4 @@
+-- Highlighting
 local ns = vim.api.nvim_create_namespace('nvim.pack.confirm')
 vim.api.nvim_buf_clear_namespace(0, ns, 0, -1)
 
@@ -49,3 +50,15 @@ for i, l in ipairs(lines) do
     hi_range(i, 4, l:len(), 'DiagnosticHint')
   end
 end
+
+-- Mappings
+local map_section_jump = function(lhs, search_flags, desc)
+  vim.keymap.set({ 'n', 'x' }, lhs, function()
+    for _ = 1, vim.v.count1 do
+      vim.fn.search('^## ', search_flags)
+    end
+  end, { buffer = 0, desc = desc })
+end
+
+map_section_jump('[[', 'bsW', 'Previous plugin')
+map_section_jump(']]', 'sW', 'Next plugin')

runtime/lua/vim/pack.lua

@@ -957,8 +957,10 @@ end
 ---     - If `false`, show confirmation buffer. It lists data about all set to
 ---       update plugins. Pending changes starting with `>` will be applied while
 ---       the ones starting with `<` will be reverted.
----       It has special in-process LSP server attached to provide more interactive
----       features. Currently supported methods:
+---       It has dedicated buffer-local mappings:
+---       - |]]| and |[[| to navigate through plugin sections.
+---
+---       Some features are provided  via LSP:
 ---         - 'textDocument/documentSymbol' (`gO` via |lsp-defaults|
 ---           or |vim.lsp.buf.document_symbol()|) - show structure of the buffer.
 ---         - 'textDocument/hover' (`K` via |lsp-defaults| or |vim.lsp.buf.hover()|) -