Fix adaptive height with an inline header or footer border

- extraLines() used borderLines(), which reports zero for BorderInline
- Divider drawn for an inline section still takes a line, and
  resizeWindows() reserves it via addInline()
- So adaptive height came up one line short per inline section and the
  list scrolled
- Affects --header-lines-border, --header-border and --footer-border
  alike. All three set came up three lines short
- Without a list border the shape normalizes to BorderTop or BorderBottom,
  which report a line, hence --no-list-border looked like a fix

    seq 10 | fzf --height=~100% --list-border \
                 --header-lines=1 --header-lines-border=inline

Fix #4904

test/test_layout.rb

@@ -882,6 +882,28 @@ class TestLayout < TestInteractive
     tmux.until { assert_block(block, it) }
   end
 
+  def test_adaptive_height_with_inline_sections
+    tmux.send_keys %(seq 10 | #{FZF} --height=~100% --list-border --header-lines=1 --header-lines-border=inline), :Enter
+    block = <<~BLOCK
+      ╭──────
+      │   10
+      │   9
+      │   8
+      │   7
+      │   6
+      │   5
+      │   4
+      │   3
+      │ > 2
+      ├──────
+      │   1
+      ╰──────
+          9/9
+        >
+    BLOCK
+    tmux.until { assert_block(block, it) }
+  end
+
   def test_style_full_adaptive_height
     tmux.send_keys %(seq 1| #{FZF} --style=full:rounded --height=~100% --header-lines=1 --info=default), :Enter
     block = <<~BLOCK