🐛 Fix helper/input cancellation on Vim

Fix `helper/input` does not return `null` on <ESC>/<C-c> if the cursor
is not at the end of line on Vim.

Author: mityu

helper/input.ts

@@ -71,8 +71,8 @@ async function ensurePrerequisites(denops: Denops): Promise<string> {
     function! s:input_${suffix}(prompt, text, completion) abort
       let originalEsc = maparg('<Esc>', 'c', 0, 1)
       let originalInt = maparg('<C-c>', 'c', 0, 1)
-      execute printf('cnoremap <nowait><buffer> <Esc> <C-u>%s<CR>', s:escape_token_${suffix})
-      execute printf('cnoremap <nowait><buffer> <C-c> <C-u>%s<CR>', s:escape_token_${suffix})
+      execute printf('cnoremap <nowait><buffer> <Esc> <C-e><C-u>%s<CR>', s:escape_token_${suffix})
+      execute printf('cnoremap <nowait><buffer> <C-c> <C-e><C-u>%s<CR>', s:escape_token_${suffix})
       try
         let result = a:completion is# v:null
               \\ ? input(a:prompt, a:text)

helper/input_test.ts

@@ -135,7 +135,7 @@ test({
           helper.define(
             "CmdlineEnter",
             "*",
-            `call feedkeys("Hello world!\\<Esc>", "it")`,
+            `call feedkeys("Hello world!\\<Left>\\<Esc>", "it")`,
           );
         });
         const result = await input(denops);
@@ -150,7 +150,7 @@ test({
           helper.define(
             "CmdlineEnter",
             "*",
-            `call feedkeys("Hello world!\\<C-c>", "it")`,
+            `call feedkeys("Hello world!\\<Left>\\<C-c>", "it")`,
           );
         });
         const result = await input(denops);