Don't include text bubbles in touching queries

Author: adroitwhiz

src/RenderWebGL.js

@@ -859,7 +859,11 @@ class RenderWebGL extends EventEmitter {
             gl.colorMask(true, true, true, true);
 
             this._drawThese(candidateIDs, ShaderManager.DRAW_MODE.default, projection,
-                {idFilterFunc: testID => testID !== drawableID}
+                {idFilterFunc: testID =>
+                    testID !== drawableID &&
+                    // Text bubbles aren't considered in "touching" queries
+                    !(this._allDrawables[testID].skin instanceof TextBubbleSkin)
+                }
             );
         } finally {
             gl.colorMask(true, true, true, true);
@@ -1293,6 +1297,8 @@ class RenderWebGL extends EventEmitter {
             const id = candidateIDs[index];
             if (id !== drawableID) {
                 const drawable = this._allDrawables[id];
+                // Text bubbles aren't considered in "touching" queries
+                if (drawable.skin instanceof TextBubbleSkin) continue;
                 if (drawable.skin && drawable._visible) {
                     // Update the CPU position data
                     drawable.updateMatrix();

src/TextBubbleSkin.js

@@ -241,6 +241,11 @@ class TextBubbleSkin extends Skin {
         this._renderedScale = scale;
     }
 
+    updateSilhouette (scale = [100, 100]) {
+        // Ensure a silhouette exists.
+        this.getTexture(scale);
+    }
+
     /**
      * @param {Array<number>} scale - The scaling factors to be used, each in the [0,100] range.
      * @return {WebGLTexture} The GL texture representation of this skin when drawing at the given scale.