fix: text input caret (#2807)

Co-authored-by: Copperbane <71472964+Copperbane@users.noreply.github.com>
Co-authored-by: Arufonsu <17498701+Arufonsu@users.noreply.github.com>

Author: Copperbane

Intersect.Client.Framework/Gwen/Control/Label.cs

@@ -745,31 +745,31 @@ protected override void OnChildBoundsChanged(Base child, Rectangle oldChildBound
     {
         base.OnChildBoundsChanged(child, oldChildBounds, newChildBounds);
 
-        if (oldChildBounds.Size != newChildBounds.Size)
+        if (oldChildBounds.Size == newChildBounds.Size)
         {
-            if (_autoSizeToContents)
-            {
-                Invalidate();
-            }
-            else
+            return;
+        }
+
+        if (!_autoSizeToContents)
+        {
+            if (child is Text)
             {
-                if (child is Text)
+                var textSize = newChildBounds.Size;
+                var ownSize = Size;
+                if (textSize.X > ownSize.X || textSize.Y > ownSize.Y)
                 {
-                    var textSize = newChildBounds.Size;
-                    var ownSize = Size;
-                    if (textSize.X > ownSize.X || textSize.Y > ownSize.Y)
-                    {
-                        OnTextExceedsSize(ownSize, textSize);
-                    }
+                    OnTextExceedsSize(ownSize, textSize);
                 }
-
-                AlignTextElement(_textElement);
             }
         }
+
+        // Always invalidate when text bounds change
+        Invalidate();
     }
 
     protected virtual void OnTextExceedsSize(Point ownSize, Point textSize)
     {
+        Invalidate();
     }
 
     public virtual void SetTextScale(float scale)

Intersect.Client.Framework/Gwen/ControlInternal/Text.cs

@@ -365,11 +365,34 @@ public Point GetCharacterPosition(int index)
         }
 
         var substring = displayedText[..index];
-        var substringSize = Skin.Renderer.MeasureText(font, fontSize: _fontSize, substring) with
+        var substringSize = Skin.Renderer.MeasureText(font, fontSize: _fontSize, substring, _scale) with
         {
             Y = 0,
         };
 
+        if (substringSize.X <= 0 && substring.Length > 0)
+        {
+            var referenceCharWidth = Skin.Renderer.MeasureText(font, fontSize: _fontSize, "n", _scale).X;
+
+            if (referenceCharWidth <= 0)
+            {
+                referenceCharWidth = (int)(_fontSize * 0.6f);
+            }
+
+            var spaceWidth = (int)(referenceCharWidth * 0.4f);
+            var accumulatedWidth = 0;
+
+            for (int i = 0; i < substring.Length; i++)
+            {
+                var charStr = substring[i].ToString();
+                var charSize = Skin.Renderer.MeasureText(font, fontSize: _fontSize, charStr, _scale);
+
+                accumulatedWidth += charSize.X > 0 ? charSize.X : spaceWidth;
+            }
+
+            return new Point(accumulatedWidth, 0);
+        }
+
         return substringSize;
     }