core: Render EditText's selection when filters are present

This patch ensures that the selection in EditText is rendered even when
filters are present (so that cache as bitmap is enabled).
This is done by invalidating the cached bitmap on selection change.

core/src/display_object/edit_text.rs

@@ -1256,12 +1256,18 @@ impl<'gc> EditText<'gc> {
 
     pub fn set_selection(self, selection: Option<TextSelection>, gc_context: &Mutation<'gc>) {
         let mut text = self.0.write(gc_context);
+        let old_selection = text.selection;
         if let Some(mut selection) = selection {
             selection.clamp(text.text_spans.text().len());
             text.selection = Some(selection);
         } else {
             text.selection = None;
         }
+
+        if old_selection != text.selection {
+            drop(text);
+            self.invalidate_cached_bitmap(gc_context);
+        }
     }
 
     pub fn reset_selection_blinking(self, gc_context: &Mutation<'gc>) {
@@ -2342,8 +2348,7 @@ impl<'gc> TInteractiveObject<'gc> for EditText<'gc> {
         let mut link_to_open = None;
 
         if let Some(position) = self.screen_position_to_index(*context.mouse_position) {
-            self.0.write(context.gc_context).selection =
-                Some(TextSelection::for_position(position));
+            self.set_selection(Some(TextSelection::for_position(position)), context.gc());
 
             if let Some((span_index, _)) =
                 self.0.read().text_spans.resolve_position_as_span(position)
@@ -2356,8 +2361,10 @@ impl<'gc> TInteractiveObject<'gc> for EditText<'gc> {
                     .map(|s| (s.url.clone(), s.target.clone()));
             }
         } else {
-            self.0.write(context.gc_context).selection =
-                Some(TextSelection::for_position(self.text_length()));
+            self.set_selection(
+                Some(TextSelection::for_position(self.text_length())),
+                context.gc(),
+            );
         }
 
         if let Some((url, target)) = link_to_open {
@@ -2442,7 +2449,7 @@ impl<'gc> TInteractiveObject<'gc> for EditText<'gc> {
     ) {
         let is_avm1 = !self.movie().is_action_script_3();
         if !focused && is_avm1 {
-            self.0.write(context.gc_context).selection = None;
+            self.set_selection(None, context.gc_context);
         }
     }
 
@@ -2504,6 +2511,14 @@ pub struct TextSelection {
     blink_epoch: DateTime<Utc>,
 }
 
+impl PartialEq for TextSelection {
+    fn eq(&self, other: &Self) -> bool {
+        self.from == other.from && self.to == other.to
+    }
+}
+
+impl Eq for TextSelection {}
+
 /// Information about the start and end y-coordinates of a given line of text
 #[derive(Copy, Clone, Debug)]
 pub struct LineData {