[release-0.4] paste: fix handling of "<" in cmdline (#11094)

Fixes https://github.com/neovim/neovim/issues/11088.

src/nvim/lua/vim.lua

@@ -189,7 +189,7 @@ paste = (function()
     if mode == 'c' and not got_line1 then  -- cmdline-mode: paste only 1 line.
       got_line1 = (#lines > 1)
       vim.api.nvim_set_option('paste', true)  -- For nvim_input().
-      local line1, _ = string.gsub(lines[1], '[\r\n\012\027]', ' ')  -- Scrub.
+      local line1 = lines[1]:gsub('<', '<lt>'):gsub('[\r\n\012\027]', ' ')  -- Scrub.
       vim.api.nvim_input(line1)
       vim.api.nvim_set_option('paste', false)
     elseif mode ~= 'c' then  -- Else: discard remaining cmdline-mode chunks.

test/functional/terminal/tui_spec.lua

@@ -578,6 +578,23 @@ describe('TUI', function()
     ]])
   end)
 
+  it('paste: less-than sign in cmdline  #11088', function()
+    local expected = '<'
+    feed_data(':')
+    wait_for_mode('c')
+    -- "bracketed paste"
+    feed_data('\027[200~'..expected..'\027[201~')
+    screen:expect{grid=[[
+                                                        |
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {5:[No Name]                                         }|
+      :<{1: }                                               |
+      {3:-- TERMINAL --}                                    |
+    ]]}
+  end)
+
   it('paste: big burst of input', function()
     feed_data(':set ruler\n')
     local t = {}