Fix issue with snapping lines and polygons to other shapes

(closes #1660)

This is a regression of #648 that got introduced sometime around the Pixi v8 upgrade #1495
Basically - when drawing, we don't want the drawing shapes to try to hit themselves.

modules/pixi/PixiFeatureLine.js

@@ -199,7 +199,7 @@ export class PixiFeatureLine extends AbstractFeature {
       }
 
       // Buffer around line, used for hit area and halo..
-      if (this.visible) {
+      if (this.visible && !this._classes.has('drawing')) {  // Rapid#648 - If drawing, `hitArea = null`
         // what line width to use?? copied the 'casing' calculation from below, improve this later
         const minwidth = 3;
         let width = style.casing.width;

modules/pixi/PixiFeaturePoint.js

@@ -285,8 +285,7 @@ export class PixiFeaturePoint extends AbstractFeature {
   updateHitArea() {
     if (!this.visible) return;
 
-    // Fix for Rapid#648: If we're drawing, we don't need to hit ourselves.
-    if (this._classes.has('drawing')) {
+    if (this._classes.has('drawing')) {  // Rapid#648 - If drawing, `hitArea = null`
       this.container.hitArea = null;
       return;
     }

modules/pixi/PixiFeaturePolygon.js

@@ -293,6 +293,8 @@ export class PixiFeaturePolygon extends AbstractFeature {
     // STROKES
     strokes.removeChildren();
     if (strokes.visible && rings.length) {
+      strokes.eventMode = this._classes.has('drawing') ? 'none' : 'static';  // Rapid#648
+
       const lineWidth = isWireframeMode ? 1 : style.fill.width || 2;
       const strokeStyle = {
         alpha: 1,
@@ -334,7 +336,6 @@ export class PixiFeaturePolygon extends AbstractFeature {
 
         stroke.hitArea = new PIXI.Polygon(buffer.perimeter);
         stroke.label = `stroke${i}`;
-        stroke.eventMode = 'static';
         stroke.sortableChildren = false;
         strokes.addChild(stroke);
       }
@@ -343,6 +344,8 @@ export class PixiFeaturePolygon extends AbstractFeature {
 
     // FILL
     if (fill.visible && rings.length) {
+      fill.eventMode = this._classes.has('drawing') ? 'none' : 'static';  // Rapid#648
+
       const fillStyle = {
         color: color,
         alpha: alpha,