Fix label color for inactive tabs (#3899)

This PR fixes an issue where certain tabs were not using the correct
color for their labels when they were inactive.

Release Notes:

- Fixed an issue where some inactive tabs were not using the correct
label color.

crates/diagnostics/src/diagnostics.rs

@@ -641,8 +641,13 @@ impl Item for ProjectDiagnosticsEditor {
 
     fn tab_content(&self, _detail: Option<usize>, selected: bool, _: &WindowContext) -> AnyElement {
         if self.summary.error_count == 0 && self.summary.warning_count == 0 {
-            let label = Label::new("No problems");
-            label.into_any_element()
+            Label::new("No problems")
+                .color(if selected {
+                    Color::Default
+                } else {
+                    Color::Muted
+                })
+                .into_any_element()
         } else {
             h_stack()
                 .gap_1()

crates/language_tools/src/lsp_log.rs

@@ -10,7 +10,7 @@ use language::{LanguageServerId, LanguageServerName};
 use lsp::IoKind;
 use project::{search::SearchQuery, Project};
 use std::{borrow::Cow, sync::Arc};
-use ui::{h_stack, popover_menu, Button, Checkbox, Clickable, ContextMenu, Label, Selection};
+use ui::{popover_menu, prelude::*, Button, Checkbox, ContextMenu, Label, Selection};
 use workspace::{
     item::{Item, ItemHandle},
     searchable::{SearchEvent, SearchableItem, SearchableItemHandle},
@@ -614,8 +614,14 @@ impl Item for LspLogView {
         Editor::to_item_events(event, f)
     }
 
-    fn tab_content(&self, _: Option<usize>, _: bool, _: &WindowContext<'_>) -> AnyElement {
-        Label::new("LSP Logs").into_any_element()
+    fn tab_content(&self, _: Option<usize>, selected: bool, _: &WindowContext<'_>) -> AnyElement {
+        Label::new("LSP Logs")
+            .color(if selected {
+                Color::Default
+            } else {
+                Color::Muted
+            })
+            .into_any_element()
     }
 
     fn as_searchable(&self, handle: &View<Self>) -> Option<Box<dyn SearchableItemHandle>> {

crates/language_tools/src/syntax_tree_view.rs

@@ -405,8 +405,14 @@ impl Item for SyntaxTreeView {
 
     fn to_item_events(_: &Self::Event, _: impl FnMut(workspace::item::ItemEvent)) {}
 
-    fn tab_content(&self, _: Option<usize>, _: bool, _: &WindowContext<'_>) -> AnyElement {
-        Label::new("Syntax Tree").into_any_element()
+    fn tab_content(&self, _: Option<usize>, selected: bool, _: &WindowContext<'_>) -> AnyElement {
+        Label::new("Syntax Tree")
+            .color(if selected {
+                Color::Default
+            } else {
+                Color::Muted
+            })
+            .into_any_element()
     }
 
     fn clone_on_split(