Redraw when change-header changes line count

The inline header slot's row budget depends on header content length,
but resizeIfNeeded() tolerates a shorter-than-wanted inline window, so
the stale slot stays. Drive a redraw on length change to re-run the
layout.

src/terminal.go

@@ -6781,10 +6781,16 @@ func (t *Terminal) Loop() error {
 				t.cx = len(t.input)
 			case actChangeHeader, actTransformHeader, actBgTransformHeader:
 				capture(false, func(header string) {
-					// When a dedicated header window is not used, we may need to
-					// update other elements as well.
 					if t.changeHeader(header) {
-						req(reqList, reqPrompt, reqInfo)
+						// resizeIfNeeded() tolerates a shorter-than-wanted inline
+						// window, so a length change can leave the inline slot
+						// stale. Force a redraw to re-run the layout. Non-inline
+						// shapes are handled by resizeIfNeeded.
+						if t.headerBorderShape == tui.BorderInline {
+							req(reqRedraw)
+						} else {
+							req(reqList, reqPrompt, reqInfo)
+						}
 					}
 					req(reqHeader)
 				})

test/test_layout.rb

@@ -1527,6 +1527,19 @@ class TestLayout < TestInteractive
     end
   end
 
+  # Regression: with --header-border=inline and --header-lines but no
+  # --header, the inline slot was sized for header-lines only. After
+  # change-header added a main header line, resizeIfNeeded tolerated the
+  # too-small slot, so the header-lines line got displaced and disappeared.
+  def test_inline_change_header_grows_slot
+    tmux.send_keys %(seq 5 | #{FZF} --style full --header-lines 1 --header-border inline --bind space:change-header:tada), :Enter
+    tmux.until { |lines| lines.any_include?(/\A│\s+1\s+│\z/) }
+    tmux.send_keys ' '
+    tmux.until do |lines|
+      lines.any_include?(/\A│\s+1\s+│\z/) && lines.any_include?(/\A│\s+tada\s+│\z/)
+    end
+  end
+
   # Invalid inline combinations must be rejected at startup.
   def test_inline_rejected_on_unsupported_options
     [