Remove Modifiers from RawInput and make it a egui::Event (#8336)

- needs #8335 

Previously it was impossible to correctly set modifiers via egui
inspection, since that only passes egui::Event and egui::Event had no
way to generally express modifiers.
Now modifiers are passed to egui as a Event and not as a field of
`RawInput`.

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

crates/eframe/src/web/events.rs

@@ -196,7 +196,7 @@ pub(crate) fn on_keydown(event: web_sys::KeyboardEvent, runner: &mut AppRunner)
     }
 
     let modifiers = modifiers_from_kb_event(&event);
-    runner.input.raw.modifiers = modifiers;
+    runner.input.set_modifiers(modifiers);
 
     let key = event.key();
     let egui_key = translate_key(&key);
@@ -287,7 +287,7 @@ fn install_keyup(runner_ref: &WebRunner, target: &EventTarget) -> Result<(), JsV
 #[expect(clippy::needless_pass_by_value)] // So that we can pass it directly to `add_event_listener`
 pub(crate) fn on_keyup(event: web_sys::KeyboardEvent, runner: &mut AppRunner) {
     let modifiers = modifiers_from_kb_event(&event);
-    runner.input.raw.modifiers = modifiers;
+    runner.input.set_modifiers(modifiers);
 
     let mut should_stop_propagation = true;
 
@@ -535,11 +535,11 @@ fn install_pointerdown(runner_ref: &WebRunner, target: &EventTarget) -> Result<(
         "pointerdown",
         |event: web_sys::PointerEvent, runner: &mut AppRunner| {
             let modifiers = modifiers_from_mouse_event(&event);
-            runner.input.raw.modifiers = modifiers;
+            runner.input.set_modifiers(modifiers);
             let mut should_stop_propagation = true;
             if let Some(button) = button_from_mouse_event(&event) {
                 let pos = pos_from_mouse_event(runner.canvas(), &event, runner.egui_ctx());
-                let modifiers = runner.input.raw.modifiers;
+                let modifiers = runner.input.modifiers;
                 let egui_event = egui::Event::PointerButton {
                     pos,
                     button,
@@ -572,7 +572,7 @@ fn install_pointerup(runner_ref: &WebRunner, target: &EventTarget) -> Result<(),
         "pointerup",
         |event: web_sys::PointerEvent, runner| {
             let modifiers = modifiers_from_mouse_event(&event);
-            runner.input.raw.modifiers = modifiers;
+            runner.input.set_modifiers(modifiers);
 
             let pos = pos_from_mouse_event(runner.canvas(), &event, runner.egui_ctx());
 
@@ -581,7 +581,7 @@ fn install_pointerup(runner_ref: &WebRunner, target: &EventTarget) -> Result<(),
                 egui::pos2(event.client_x() as f32, event.client_y() as f32),
             ) && let Some(button) = button_from_mouse_event(&event)
             {
-                let modifiers = runner.input.raw.modifiers;
+                let modifiers = runner.input.modifiers;
                 let egui_event = egui::Event::PointerButton {
                     pos,
                     button,
@@ -647,7 +647,7 @@ fn is_interested_in_pointer_event(runner: &AppRunner, pos: egui::Pos2) -> bool {
 fn install_mousemove(runner_ref: &WebRunner, target: &EventTarget) -> Result<(), JsValue> {
     runner_ref.add_event_listener(target, "mousemove", |event: web_sys::MouseEvent, runner| {
         let modifiers = modifiers_from_mouse_event(&event);
-        runner.input.raw.modifiers = modifiers;
+        runner.input.set_modifiers(modifiers);
 
         let pos = pos_from_mouse_event(runner.canvas(), &event, runner.egui_ctx());
 
@@ -705,7 +705,7 @@ fn install_touchstart(runner_ref: &WebRunner, target: &EventTarget) -> Result<()
                     pos,
                     button: egui::PointerButton::Primary,
                     pressed: true,
-                    modifiers: runner.input.raw.modifiers,
+                    modifiers: runner.input.modifiers,
                 };
                 should_stop_propagation = (runner.web_options.should_stop_propagation)(&egui_event);
                 should_prevent_default = (runner.web_options.should_prevent_default)(&egui_event);
@@ -770,7 +770,7 @@ fn install_touchend(runner_ref: &WebRunner, target: &EventTarget) -> Result<(),
                 pos,
                 button: egui::PointerButton::Primary,
                 pressed: false,
-                modifiers: runner.input.raw.modifiers,
+                modifiers: runner.input.modifiers,
             };
             should_stop_propagation &= (runner.web_options.should_stop_propagation)(&egui_event);
             should_prevent_default &= (runner.web_options.should_prevent_default)(&egui_event);
@@ -832,7 +832,7 @@ fn install_wheel(runner_ref: &WebRunner, target: &EventTarget) -> Result<(), JsV
 
         let modifiers = modifiers_from_wheel_event(&event);
 
-        let egui_event = if modifiers.ctrl && !runner.input.raw.modifiers.ctrl {
+        let egui_event = if modifiers.ctrl && !runner.input.modifiers.ctrl {
             // The browser is saying the ctrl key is down, but it isn't _really_.
             // This happens on pinch-to-zoom on multitouch trackpads
             // egui will treat ctrl+scroll as zoom, so it all works.