gtk4: Update cursor from WebView cursor events

The cursor is updated from mouse-target-changed signal.

It can be: hand, text or left_ptr.

To get each cursor it is using the gdk_cursor_new_from_name func with the
cursor_names definitions.

platform/gtk4/cog-platform-gtk4.c

@@ -12,6 +12,7 @@
 
 #include "../../core/cog.h"
 #include "../common/cog-gl-utils.h"
+#include "../common/cursors.h"
 #include "cog-gtk-settings-dialog.h"
 
 #define DEFAULT_WIDTH 1280
@@ -744,6 +745,37 @@ on_back_forward_changed(WebKitBackForwardList* back_forward_list,
     gtk_widget_set_sensitive(win->forward_button,
         webkit_web_view_can_go_forward(win->web_view));
 }
+static void
+set_cursor(enum cursor_type type)
+{
+    GdkCursor *cursor = NULL;
+
+    for (int i = 0; !cursor && i < G_N_ELEMENTS(cursor_names[type]); i++) {
+        cursor = gdk_cursor_new_from_name(cursor_names[type][i], NULL);
+    }
+
+	if (!cursor) {
+		g_warning("Could not get %s cursor", cursor_names[type][0]);
+        return;
+	}
+
+    gtk_widget_set_cursor(win.gtk_window, cursor);
+    g_clear_object(&cursor);
+}
+
+static void
+on_mouse_target_changed(WebKitWebView *view, WebKitHitTestResult *hitTestResult, guint mouseModifiers)
+{
+    if (webkit_hit_test_result_context_is_link(hitTestResult)) {
+        set_cursor(CURSOR_HAND);
+    } else if (webkit_hit_test_result_context_is_editable(hitTestResult)) {
+        set_cursor(CURSOR_TEXT);
+    } else if (webkit_hit_test_result_context_is_selection(hitTestResult)) {
+        set_cursor(CURSOR_TEXT);
+    } else {
+        set_cursor(CURSOR_LEFT_PTR);
+    }
+}
 
 static void
 cog_gtk4_platform_init_web_view(CogPlatform* platform, WebKitWebView* view)
@@ -754,6 +786,7 @@ cog_gtk4_platform_init_web_view(CogPlatform* platform, WebKitWebView* view)
         G_CALLBACK(on_load_progress), &win);
     g_signal_connect(webkit_web_view_get_back_forward_list(view), "changed",
         G_CALLBACK(on_back_forward_changed), &win);
+    g_signal_connect(view, "mouse-target-changed", G_CALLBACK(on_mouse_target_changed), NULL);
     win.web_view = view;
 
     win.device_scale_factor = gtk_widget_get_scale_factor(win.gl_drawing_area);