From 76d0da58d9f87eeebc1206eca3f046df7b10946c Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 13 Mar 2026 03:10:38 +0000
Subject: [PATCH 1/2] Initial plan


From 7fc97ff11ddf946a72c2ebe516ac94e3d9e4e9d5 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 13 Mar 2026 03:17:13 +0000
Subject: [PATCH 2/2] perf: cache URI validation in Link to avoid repeated work
 on redraws

Co-authored-by: tig <585482+tig@users.noreply.github.com>
---
 Terminal.Gui/Views/Link.cs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Terminal.Gui/Views/Link.cs b/Terminal.Gui/Views/Link.cs
index ce43d2780d..2bd7ccfc51 100644
--- a/Terminal.Gui/Views/Link.cs
+++ b/Terminal.Gui/Views/Link.cs
@@ -180,15 +180,16 @@ protected override void UpdateTextFormatterText ()
     public const string DEFAULT_URL = "";
 
     private string _url = DEFAULT_URL;
+    private bool _isUrlValid = false;
 
     /// <summary>
     ///     Gets or sets the URL (hyperlink target) associated with this <see cref="Link"/>.
     /// </summary>
     /// <remarks>
     ///     <para>
-    ///         Any string value is accepted. URL validation occurs at draw time: if the value is not a well-formed
-    ///         absolute URI (per <see cref="Uri.IsWellFormedUriString"/>), the link renders with the
-    ///         <see cref="VisualRole.Disabled"/> style and no OSC 8 hyperlink sequence is emitted.
+    ///         Any string value is accepted. URL validation is performed once when this property is set and the result is
+    ///         cached: if the value is not a well-formed absolute URI (per <see cref="Uri.IsWellFormedUriString"/>), the
+    ///         link renders with the <see cref="VisualRole.Disabled"/> style and no OSC 8 hyperlink sequence is emitted.
     ///     </para>
     ///     <para>
     ///         When <see cref="View.Text"/> is empty, <see cref="Url"/> is used as the display text.
@@ -319,7 +320,7 @@ protected override bool OnDrawingText (DrawContext? context)
         string? url = Url;
 
         // If the URL is not valid, don't set CurrentUrl, and adjust the attributes to indicate it's not well-formed
-        if (!Uri.IsWellFormedUriString (Url, UriKind.Absolute))
+        if (!_isUrlValid)
         {
             normalAttr = GetAttributeForRole (VisualRole.Disabled);
             normalAttr = normalAttr with { Background = HasFocus ? GetAttributeForRole (VisualRole.Focus).Background : normalAttr.Background };
@@ -372,6 +373,7 @@ private void SetUrl (string value)
 
         // Do the work
         _url = value;
+        _isUrlValid = Uri.IsWellFormedUriString (value, UriKind.Absolute);
 
         // CWP: Fire ValueChanged
         ValueChangedEventArgs<string> changedArgs = new (oldValue, value);