Fixed elements sometimes staying hidden when they shouldn't in scrolling panels

CHANGELOG.md

@@ -28,11 +28,13 @@ Improvements
 - Turned Tooltip paragraph styling into style properties
 - Improved ElementHelper.AddTooltip overloads
 - Don't query a paragraph's text callback in the constructor
+- Allow manually hiding a paragraph without its text overriding the hidden state
 
 Fixes
 - Fixed auto-nav tooltip displaying on the selected element even when not in auto-nav mode
 - Fixed radio buttons not unchecking all other radio buttons with the same root element
 - Fixed elements not being deselected when removed through RemoveChild
+- Fixed elements sometimes staying hidden when they shouldn't in scrolling panels
 
 Removals
 - Marked old Draw and DrawTransformed overloads as obsolete in favor of SpriteBatchContext ones

MLEM.Ui/Elements/Element.cs

@@ -901,13 +901,14 @@ namespace MLEM.Ui.Elements {
         }
 
         /// <summary>
-        /// Updates this element and all of its <see cref="GetRelevantChildren"/>
+        /// Updates this element and all of its <see cref="SortedChildren"/>
         /// </summary>
         /// <param name="time">The game's time</param>
         public virtual void Update(GameTime time) {
             this.System.InvokeOnElementUpdated(this, time);
 
-            foreach (var child in this.GetRelevantChildren()) {
+            // update all sorted children, not just relevant ones, because they might become relevant or irrelevant through updates
+            foreach (var child in this.SortedChildren) {
                 if (child.System != null)
                     child.Update(time);
             }

MLEM.Ui/Elements/Paragraph.cs

@@ -59,8 +59,13 @@ namespace MLEM.Ui.Elements {
             set {
                 if (this.text != value) {
                     this.text = value;
-                    this.IsHidden = string.IsNullOrWhiteSpace(this.text);
                     this.SetTextDirty();
+                    
+                    var force = string.IsNullOrWhiteSpace(this.text);
+                    if (this.forceHide != force) {
+                        this.forceHide = force;
+                        this.SetAreaDirty();
+                    }
                 }
             }
         }
@@ -99,9 +104,13 @@ namespace MLEM.Ui.Elements {
             }
         }
 
+        /// <inheritdoc />
+        public override bool IsHidden => base.IsHidden || this.forceHide;
+
         private string text;
         private StyleProp<TextAlignment> alignment;
         private StyleProp<GenericFont> regularFont;
+        private bool forceHide;
 
         /// <summary>
         /// Creates a new paragraph with the given settings.
@@ -110,14 +119,12 @@ namespace MLEM.Ui.Elements {
         /// <param name="width">The paragraph's width. Note that its height is automatically calculated.</param>
         /// <param name="textCallback">The paragraph's text</param>
         /// <param name="autoAdjustWidth">Whether the paragraph's width should automatically be calculated based on the text within it.</param>
-        public Paragraph(Anchor anchor, float width, TextCallback textCallback, bool autoAdjustWidth = false) : this(anchor, width, "", autoAdjustWidth) {
-            this.IsHidden = true;
+        public Paragraph(Anchor anchor, float width, TextCallback textCallback, bool autoAdjustWidth = false) : this(anchor, width, string.Empty, autoAdjustWidth) {
             this.GetTextCallback = textCallback;
         }
 
         /// <inheritdoc cref="Paragraph(Anchor,float,TextCallback,bool)"/>
         public Paragraph(Anchor anchor, float width, string text, bool autoAdjustWidth = false) : base(anchor, new Vector2(width, 0)) {
-            this.IsHidden = true;
             this.Text = text;
             this.AutoAdjustWidth = autoAdjustWidth;
             this.CanBeSelected = false;