🎭 Add tooltipopen attribute to tooltip opener nodes when a tooltip be…

…gins showing

actors/DotTooltipListenerChild.sys.mjs

@@ -152,13 +152,22 @@ export class DotTooltipListenerChild extends JSWindowActorChild {
 			Services.els.removeSystemEventListener(doc, "mouseup", this, true);
 			Services.els.removeSystemEventListener(doc, "keydown", this, true);
 
+			Services.els.removeSystemEventListener(
+				this._currentTooltip,
+				"popupshowing",
+				this,
+				false
+			);
+
 			Services.els.removeSystemEventListener(
 				this._currentTooltip,
 				"popuphiding",
 				this,
 				false
 			);
 
+			this._currentTriggerNode.removeAttribute("tooltipopen");
+
 			this.killTooltipTimer();
 
 			this._currentTooltip = null;
@@ -353,6 +362,13 @@ export class DotTooltipListenerChild extends JSWindowActorChild {
 			triggerNode || event.target
 		);
 
+		Services.els.addSystemEventListener(
+			tooltip,
+			"popupshowing",
+			this,
+			false
+		);
+
 		Services.els.addSystemEventListener(
 			tooltip,
 			"popuphiding",
@@ -383,7 +399,7 @@ export class DotTooltipListenerChild extends JSWindowActorChild {
 				this._currentTriggerNode,
 				tooltipAnchor,
 				0,
-				-kTooltipMouseTopMargin,
+				0,
 				false,
 				false,
 				event
@@ -507,6 +523,18 @@ export class DotTooltipListenerChild extends JSWindowActorChild {
 		}
 	}
 
+	/**
+	 * Fired when the tooltip starts showing
+	 */
+	onTooltipShowing() {
+		if (!this._currentTooltip) return;
+
+		this._currentTriggerNode.setAttribute(
+			"tooltipopen",
+			this._currentTooltip.id || ""
+		);
+	}
+
 	/**
 	 * Adds tooltip support to a node
 	 * @param {Node} node
@@ -549,6 +577,11 @@ export class DotTooltipListenerChild extends JSWindowActorChild {
 			return;
 		}
 
+		if (event.type == "popupshowing") {
+			this.onTooltipShowing();
+			return;
+		}
+
 		if (event.type == "popuphiding") {
 			this.destroyTooltip();
 			return;