fix #13305 Baseline SnapLines do not appear in DesignSurface (#13324)

Epica3055 · web-flow · commit 7098151ab3e4 · 2025-04-21T11:27:38.000-07:00
fix #13305 Baseline SnapLines do not appear in DesignSurface Ensure that the virtual property is called to have access to the snaplines defined on the derived class.
diff --git a/src/System.Windows.Forms.Design/src/System/Windows/Forms/Design/Behavior/BehaviorService.cs b/src/System.Windows.Forms.Design/src/System/Windows/Forms/Design/Behavior/BehaviorService.cs
@@ -799,7 +799,7 @@ private void TestHook_GetAllSnapLines(ref Message m)
 
             if (host.GetDesigner(comp) is ControlDesigner designer)
             {
-                foreach (SnapLine line in designer.SnapLinesInternal)
+                foreach (SnapLine line in designer.SnapLines)
                 {
                     snapLineInfo.Append($"{line}\tAssociated Control = {designer.Control.Name}:::");
                 }
diff --git a/src/System.Windows.Forms.Design/src/System/Windows/Forms/Design/Behavior/DragAssistanceManager.cs b/src/System.Windows.Forms.Design/src/System/Windows/Forms/Design/Behavior/DragAssistanceManager.cs
@@ -193,7 +193,7 @@ internal DragAssistanceManager(
     /// </summary>
     private void AddSnapLines(ControlDesigner controlDesigner, List<SnapLine> horizontalList, List<SnapLine> verticalList, bool isTarget, bool validTarget)
     {
-        IList<SnapLine> snapLines = controlDesigner.SnapLinesInternal;
+        IList snapLines = controlDesigner.SnapLines;
         // Used for padding snaplines
         Rectangle controlRect = controlDesigner.Control.ClientRectangle;
         // Used for all others

Original file line number	Diff line number	Diff line change
`@@ -799,7 +799,7 @@ private void TestHook_GetAllSnapLines(ref Message m)`
`799`	`799`
`800`	`800`	`if (host.GetDesigner(comp) is ControlDesigner designer)`
`801`	`801`	`{`
`802`		`- foreach (SnapLine line in designer.SnapLinesInternal)`
	`802`	`+ foreach (SnapLine line in designer.SnapLines)`
`803`	`803`	`{`
`804`	`804`	`snapLineInfo.Append($"{line}\tAssociated Control = {designer.Control.Name}:::");`
`805`	`805`	`}`
Original file line number	Diff line number	Diff line change
`@@ -193,7 +193,7 @@ internal DragAssistanceManager(`
`193`	`193`	`/// </summary>`
`194`	`194`	`private void AddSnapLines(ControlDesigner controlDesigner, List<SnapLine> horizontalList, List<SnapLine> verticalList, bool isTarget, bool validTarget)`
`195`	`195`	`{`
`196`		`- IList<SnapLine> snapLines = controlDesigner.SnapLinesInternal;`
	`196`	`+ IList snapLines = controlDesigner.SnapLines;`
`197`	`197`	`// Used for padding snaplines`
`198`	`198`	`Rectangle controlRect = controlDesigner.Control.ClientRectangle;`
`199`	`199`	`// Used for all others`