settings_ui: Last minute cleanup (#40217)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/settings/src/settings_content/editor.rs

@@ -334,7 +334,18 @@ pub struct GutterContent {
 
 /// How to render LSP `textDocument/documentColor` colors in the editor.
 #[derive(
-    Copy, Clone, Debug, Default, Serialize, Deserialize, PartialEq, Eq, JsonSchema, MergeFrom,
+    Copy,
+    Clone,
+    Debug,
+    Default,
+    Serialize,
+    Deserialize,
+    PartialEq,
+    Eq,
+    JsonSchema,
+    MergeFrom,
+    strum::VariantArray,
+    strum::VariantNames,
 )]
 #[serde(rename_all = "snake_case")]
 pub enum DocumentColorsRenderMode {

crates/settings/src/settings_content/language.rs

@@ -27,8 +27,7 @@ pub struct AllLanguageSettingsContent {
     pub languages: LanguageToSettingsMap,
     /// Settings for associating file extensions and filenames
     /// with languages.
-    #[serde(default)]
-    pub file_types: HashMap<Arc<str>, ExtendingVec<String>>,
+    pub file_types: Option<HashMap<Arc<str>, ExtendingVec<String>>>,
 }
 
 impl merge_from::MergeFrom for AllLanguageSettingsContent {

crates/settings/src/settings_content/workspace.rs

@@ -12,7 +12,7 @@ use crate::{DockPosition, DockSide, ScrollbarSettingsContent, ShowIndentGuides};
 #[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize, JsonSchema, MergeFrom)]
 pub struct WorkspaceSettingsContent {
     /// Active pane styling settings.
-    pub active_pane_modifiers: Option<ActivePanelModifiers>,
+    pub active_pane_modifiers: Option<ActivePaneModifiers>,
     /// Layout mode for the bottom dock
     ///
     /// Default: contained
@@ -243,7 +243,7 @@ pub enum ActivateOnClose {
 #[skip_serializing_none]
 #[derive(Copy, Clone, PartialEq, Debug, Default, Serialize, Deserialize, JsonSchema, MergeFrom)]
 #[serde(rename_all = "snake_case")]
-pub struct ActivePanelModifiers {
+pub struct ActivePaneModifiers {
     /// Size of the border surrounding the active pane.
     /// When set to 0, the active pane doesn't have any border.
     /// The border is drawn inset.
@@ -403,14 +403,38 @@ impl AutosaveSetting {
     }
 }
 
-#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema, MergeFrom)]
+#[derive(
+    Copy,
+    Clone,
+    Debug,
+    Serialize,
+    Deserialize,
+    PartialEq,
+    Eq,
+    JsonSchema,
+    MergeFrom,
+    strum::VariantArray,
+    strum::VariantNames,
+)]
 #[serde(rename_all = "snake_case")]
 pub enum PaneSplitDirectionHorizontal {
     Up,
     Down,
 }
 
-#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema, MergeFrom)]
+#[derive(
+    Copy,
+    Clone,
+    Debug,
+    Serialize,
+    Deserialize,
+    PartialEq,
+    Eq,
+    JsonSchema,
+    MergeFrom,
+    strum::VariantArray,
+    strum::VariantNames,
+)]
 #[serde(rename_all = "snake_case")]
 pub enum PaneSplitDirectionVertical {
     Left,