Fix missing wrap sign at ANSI color boundary

src/terminal.go

@@ -4340,6 +4340,12 @@ Loop:
 
 			var fillRet tui.FillReturn
 			wrap := t.activePreviewOpts.wrap
+			printWrapSign := func() {
+				if t.pwindow.CFill(tui.ColPreview.Fg(), tui.ColPreview.Bg(), -1, tui.Dim, t.wrapSign) == tui.FillNextLine {
+					t.pwindow.Move(t.pwindow.Y()-1, t.pwindow.Width())
+				}
+				fillRet = tui.FillContinue
+			}
 			for subIdx, subLine := range subLines {
 				// Render wrap sign for continuation sub-lines
 				if subIdx > 0 {
@@ -4350,12 +4356,16 @@ Loop:
 							break Loop
 						}
 					}
-					t.pwindow.CFill(tui.ColPreview.Fg(), tui.ColPreview.Bg(), -1, tui.Dim, t.wrapSign)
+					printWrapSign()
 				}
 
 				prefixWidth := t.pwindow.X()
 				var url *url
 				_, _, ansi = extractColor(subLine, ansi, func(str string, ansi *ansiState) bool {
+					if fillRet == tui.FillNextLine {
+						printWrapSign()
+						prefixWidth = t.pwindow.X()
+					}
 					trimmed := []rune(str)
 					isTrimmed := false
 					if !wrap {

test/test_preview.rb

@@ -582,4 +582,31 @@ class TestPreview < TestInteractive
       assert_equal 1, lines.match_count
     end
   end
+
+  def test_preview_wrap_sign_between_ansi_fragments
+    tmux.send_keys %(seq 1 | #{FZF} --preview 'echo -e "\\x1b[33m1234567890 \\x1b[mhello"; echo -e "\\x1b[33m1234567890 \\x1b[mhello"' --preview-window 10,wrap-word), :Enter
+    tmux.until do |lines|
+      assert_equal 1, lines.match_count
+      assert_equal 2, lines.count { |line| line.include?('│ 1234567890 │') }
+      assert_equal 2, lines.count { |line| line.include?('│ ↳ hello    │') }
+    end
+  end
+
+  def test_preview_wrap_sign_between_ansi_fragments_overflow
+    tmux.send_keys %(seq 1 | #{FZF} --preview 'echo -e "\\x1b[33m1234567890 \\x1b[mhello"; echo -e "\\x1b[33m1234567890 \\x1b[mhello"' --preview-window 2,wrap-word), :Enter
+    tmux.until do |lines|
+      assert_equal 1, lines.match_count
+      assert_equal 2, lines.count { |line| line.include?('│ 12 │') }
+      assert_equal 0, lines.count { |line| line.include?('│ h') }
+    end
+  end
+
+  def test_preview_wrap_sign_between_ansi_fragments_overflow2
+    tmux.send_keys %(seq 1 | #{FZF} --preview 'echo -e "\\x1b[33m1234567890 \\x1b[mhello"; echo -e "\\x1b[33m1234567890 \\x1b[mhello"' --preview-window 1,wrap-word), :Enter
+    tmux.until do |lines|
+      assert_equal 1, lines.match_count
+      assert_equal 2, lines.count { |line| line.include?('│ 1 │') }
+      assert_equal 0, lines.count { |line| line.include?('│ h') }
+    end
+  end
 end