feat(extmark): virt_lines can highlight until EOL #41289

runtime/lua/vim/_meta/api.gen.lua

@@ -671,7 +671,8 @@ function vim.api.nvim_buf_line_count(buf) end
 ---   display of the text, except 'tabstop' is used for hard tabs. The 'wrap' and
 ---   'linebreak' options do not take effect, so the number of extra screen lines will
 ---   match the list-size (but see `virt_lines_overflow`). By default lines are placed
----   below the marked line.
+---   below the marked line. Special case: If the last `text_chunk` is empty,
+---   the corresponding `hl` will extend to the end of the line.
 --- - virt_lines_above: Place virtual lines above instead.
 --- - virt_lines_leftcol: Place virtual lines in the leftmost column of the window,
 ---   bypassing sign and number columns.

runtime/lua/vim/lsp/inline_completion.lua

@@ -247,6 +247,12 @@ function Completor:show(hint)
   col = col + skip - 1
 
   local virt_lines = { unpack(lines, 2) }
+  for i, s in ipairs(virt_lines) do
+    if #s == 1 and s[1][1] == '' then
+      virt_lines[i] = {}
+    end
+  end
+
   api.nvim_buf_set_extmark(self.bufnr, namespace, row, col, {
     virt_text = virt_text,
     virt_lines = virt_lines,