apprt/gtk: add ctrl+page-up/down as prev/next tab

src/Surface.zig

@@ -927,7 +927,7 @@ pub fn keyCallback(
 
         // We only execute the binding on press/repeat but we still consume
         // the key on release so that we don't send any release events.
-        log.debug("key event consumed by binding action={}", .{binding_action});
+        log.debug("key event binding consumed={} action={}", .{ consumed, binding_action });
         if (event.action == .press or event.action == .repeat) {
             try self.performBindingAction(binding_action);
         }

src/config/Config.zig

@@ -602,6 +602,17 @@ pub fn default(alloc_gpa: Allocator) Allocator.Error!Config {
             .{ .goto_split = .right },
         );
 
+        try result.keybind.set.putUnconsumed(
+            alloc,
+            .{ .key = .page_up, .mods = .{ .ctrl = true } },
+            .{ .previous_tab = {} },
+        );
+        try result.keybind.set.putUnconsumed(
+            alloc,
+            .{ .key = .page_down, .mods = .{ .ctrl = true } },
+            .{ .next_tab = {} },
+        );
+
         // Viewport scrolling
         try result.keybind.set.put(
             alloc,