Flood fill now respects lock transparency

src/PixiEditor.ChangeableDocument/Changes/Drawing/FloodFill/FloodFillHelper.cs

@@ -45,7 +45,7 @@ public static class FloodFillHelper
         VecI startingPos,
         Color drawingColor,
         float tolerance,
-        int frame)
+        int frame, bool lockTransparency)
     {
         if (selection is not null && !selection.Contains(startingPos.X + 0.5f, startingPos.Y + 0.5f))
             return new();
@@ -77,6 +77,11 @@ public static class FloodFillHelper
         if ((colorSpaceCorrectedColor.A == 0) || colorToReplace == colorSpaceCorrectedColor)
             return new();
 
+        if (colorToReplace.A == 0 && lockTransparency)
+        {
+            return new();
+        }
+
         RectI globalSelectionBounds = (RectI?)selection?.TightBounds ?? new RectI(VecI.Zero, document.Size);
 
         // Pre-multiplies the color and convert it to floats. Since floats are imprecise, a range is used.

src/PixiEditor.ChangeableDocument/Changes/Drawing/FloodFill/FloodFill_Change.cs

@@ -2,6 +2,7 @@
 using Drawie.Backend.Core.Numerics;
 using Drawie.Backend.Core.Vector;
 using Drawie.Numerics;
+using PixiEditor.ChangeableDocument.Changeables.Graph.Nodes;
 
 namespace PixiEditor.ChangeableDocument.Changes.Drawing.FloodFill;
 
@@ -32,7 +33,7 @@ internal class FloodFill_Change : Change
     {
         if (pos.X < 0 || pos.Y < 0 || pos.X >= target.Size.X || pos.Y >= target.Size.Y)
             return false;
-        
+
         return DrawingChangeHelper.IsValidForDrawing(target, memberGuid, drawOnMask);
     }
 
@@ -46,7 +47,8 @@ internal class FloodFill_Change : Change
             target.ForEveryReadonlyMember(member => membersToReference.Add(member.Id));
         else
             membersToReference.Add(memberGuid);
-        var floodFilledChunks = FloodFillHelper.FloodFill(membersToReference, target, selection, pos, color, tolerance, frame);
+        bool lockTransparency = target.FindMember(memberGuid) is ImageLayerNode { LockTransparency: true };
+        var floodFilledChunks = FloodFillHelper.FloodFill(membersToReference, target, selection, pos, color, tolerance, frame, lockTransparency);
         if (floodFilledChunks.Count == 0)
         {
             ignoreInUndo = true;