DOCK WORKING!

Update editor element to use mouse regions instead of dispatch event for mouse events
Fix bug in presenter where mouse region handlers were stored on click and called instead of more up to date handlers from subsequent renders
Changed MouseRegion to require discriminants in all cases
Add scroll wheel event to MouseRegion
Polished a bunch of dock inconsistencies

Co-Authored-By: Mikayla Maki <mikayla@zed.dev>

crates/settings/src/settings.rs

@@ -29,6 +29,7 @@ pub struct Settings {
     pub show_completions_on_input: bool,
     pub vim_mode: bool,
     pub autosave: Autosave,
+    pub default_dock_anchor: DockAnchor,
     pub editor_defaults: EditorSettings,
     pub editor_overrides: EditorSettings,
     pub terminal_defaults: TerminalSettings,
@@ -150,6 +151,15 @@ pub enum WorkingDirectory {
     Always { directory: String },
 }
 
+#[derive(PartialEq, Eq, Debug, Default, Copy, Clone, Deserialize, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum DockAnchor {
+    #[default]
+    Bottom,
+    Right,
+    Expanded,
+}
+
 #[derive(Clone, Debug, Default, Deserialize, JsonSchema)]
 pub struct SettingsFileContent {
     pub experiments: Option<FeatureFlags>,
@@ -167,6 +177,8 @@ pub struct SettingsFileContent {
     pub vim_mode: Option<bool>,
     #[serde(default)]
     pub autosave: Option<Autosave>,
+    #[serde(default)]
+    pub default_dock_anchor: Option<DockAnchor>,
     #[serde(flatten)]
     pub editor: EditorSettings,
     #[serde(default)]
@@ -216,6 +228,7 @@ impl Settings {
             projects_online_by_default: defaults.projects_online_by_default.unwrap(),
             vim_mode: defaults.vim_mode.unwrap(),
             autosave: defaults.autosave.unwrap(),
+            default_dock_anchor: defaults.default_dock_anchor.unwrap(),
             editor_defaults: EditorSettings {
                 tab_size: required(defaults.editor.tab_size),
                 hard_tabs: required(defaults.editor.hard_tabs),
@@ -268,6 +281,8 @@ impl Settings {
         merge(&mut self.autosave, data.autosave);
         merge(&mut self.experiments, data.experiments);
         merge(&mut self.staff_mode, data.staff_mode);
+        merge(&mut self.default_dock_anchor, data.default_dock_anchor);
+
         // Ensure terminal font is loaded, so we can request it in terminal_element layout
         if let Some(terminal_font) = &data.terminal.font_family {
             font_cache.load_family(&[terminal_font]).log_err();
@@ -336,6 +351,7 @@ impl Settings {
             show_completions_on_input: true,
             vim_mode: false,
             autosave: Autosave::Off,
+            default_dock_anchor: DockAnchor::Bottom,
             editor_defaults: EditorSettings {
                 tab_size: Some(4.try_into().unwrap()),
                 hard_tabs: Some(false),