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

src/terminal.go

@@ -1547,6 +1547,14 @@ func (t *Terminal) visibleInputLinesInList() int {
 
 // Extra number of lines needed to display fzf
 func (t *Terminal) extraLines() int {
+	// borderLines() reports zero for BorderInline, but addInline() still
+	// reserves a divider line for it
+	sectionLines := func(shape tui.BorderShape) int {
+		if shape == tui.BorderInline {
+			return 1
+		}
+		return borderLines(shape)
+	}
 	extra := 0
 	if !t.inputless {
 		extra++
@@ -1562,16 +1570,16 @@ func (t *Terminal) extraLines() int {
 	}
 	if t.headerVisible {
 		if t.hasHeaderWindow() {
-			extra += borderLines(t.headerBorderShape)
+			extra += sectionLines(t.headerBorderShape)
 		}
 		extra += len(t.header0)
 		if w, shape := t.determineHeaderLinesShape(); w {
-			extra += borderLines(shape)
+			extra += sectionLines(shape)
 		}
 		extra += t.headerLines
 	}
 	if len(t.footer) > 0 {
-		extra += borderLines(t.footerBorderShape)
+		extra += sectionLines(t.footerBorderShape)
 		extra += len(t.footer)
 	}
 	return extra