chore: Allow return of component dependency Sass files (#1052)

* chore: Allow return of component dependency Sass files

* refactor: prefer functional decomposition over a new argument

* preset(shiny): remove unused Sass vars

They're `$select-` prefixed in selectize, so we weren't relying on these

* rename: component_dependency_sass_files()

R/utils-deps.R

@@ -45,15 +45,19 @@ component_dependency_sass <- function(theme) {
   }
 }
 
-component_dependency_sass_ <- function(theme) {
+component_dependency_sass_files <- function() {
   scss_dir <- path_inst("components", "scss")
   scss_files <- c(
     file.path(scss_dir, "mixins", "_mixins.scss"),
     dir(scss_dir, pattern = "\\.scss$", full.names = TRUE)
   )
 
-  # Although rare, it's possible for bs_dependency_defer() to pass 
-  # along a NULL theme (e.g., renderTags(accordion())), so fallback 
+  lapply(scss_files, sass_file)
+}
+
+component_dependency_sass_ <- function(theme) {
+  # Although rare, it's possible for bs_dependency_defer() to pass
+  # along a NULL theme (e.g., renderTags(accordion())), so fallback
   # to the default theme if need be
   theme <- theme %||% bs_theme()
 
@@ -65,7 +69,7 @@ component_dependency_sass_ <- function(theme) {
   }
 
   bs_dependency(
-    input = lapply(scss_files, sass_file),
+    input = component_dependency_sass_files(),
     theme = theme,
     name = "bslib-component-css",
     version = get_package_version("bslib"),

inst/builtin/bs5/shiny/_mixins.scss

@@ -4,9 +4,5 @@ $accordion-button-active-bg: null;
 $accordion-button-active-color: null;
 $accordion-icon-active-color: null;
 
-// Shiny: selectInput() and selectizeInput()
-$selectize-color-dropdown-item-active: $component-active-bg !default;
-$selectize-color-dropdown-item-active-text: $component-active-color !default;
-
 // Component Variables
 @import "ionrangeslider/_variables.scss";