LibWeb: Add internals API to dispatch doubleclick mouse event

Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/LadybirdBrowser/ladybird/commit/7dc11050f2e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2108
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibWeb/Internals/Internals.cpp

@@ -100,6 +100,14 @@ void Internals::click(double x, double y)
     click(x, y, UIEvents::MouseButton::Primary);
 }
 
+void Internals::doubleclick(double x, double y)
+{
+    auto& page = internals_page();
+
+    auto position = page.css_to_device_point({ x, y });
+    page.handle_doubleclick(position, position, UIEvents::MouseButton::Primary, 0, 0);
+}
+
 void Internals::middle_click(double x, double y)
 {
     click(x, y, UIEvents::MouseButton::Middle);

Userland/Libraries/LibWeb/Internals/Internals.h

@@ -30,6 +30,7 @@ public:
     void commit_text();
 
     void click(double x, double y);
+    void doubleclick(double x, double y);
     void middle_click(double x, double y);
     void move_pointer_to(double x, double y);
     void wheel(double x, double y, double delta_x, double delta_y);

Userland/Libraries/LibWeb/Internals/Internals.idl

@@ -21,6 +21,7 @@ interface Internals {
     undefined commitText();
 
     undefined click(double x, double y);
+    undefined doubleclick(double x, double y);
     undefined middleClick(double x, double y);
     undefined movePointerTo(double x, double y);
     undefined wheel(double x, double y, double deltaX, double deltaY);