CPP-44970 Enable ClangFormat without creating .clangformat file doesn't change status bar

- restore indent detection on front end


(cherry picked from commit 2f63fe3ddf5e6be30baded169f43bc7bcb2ac5d2)

IJ-CR-170723

GitOrigin-RevId: 0ff44b51b185c64ad83a14dff300dc219de773d0

platform/code-style-api/api-dump-experimental.txt

@@ -28,6 +28,7 @@ c:com.intellij.psi.codeStyle.PackageEntry
 - *sf:ALL_MODULE_IMPORTS:com.intellij.psi.codeStyle.PackageEntry
 *:com.intellij.psi.codeStyle.modifier.CodeStyleSettingsModifier
 - sf:EP_NAME:com.intellij.openapi.extensions.ExtensionPointName
+- acceptsFileIndentOptionsProviders():Z
 - getActivatingAction(com.intellij.psi.codeStyle.modifier.CodeStyleStatusBarUIContributor,com.intellij.psi.PsiFile):com.intellij.openapi.actionSystem.AnAction
 - getDisablingFunction(com.intellij.openapi.project.Project):java.util.function.Consumer
 - a:getName():java.lang.String

platform/code-style-api/src/com/intellij/psi/codeStyle/modifier/CodeStyleSettingsModifier.java

@@ -91,4 +91,9 @@ public interface CodeStyleSettingsModifier {
   default @Nullable AnAction getActivatingAction(@Nullable CodeStyleStatusBarUIContributor activeUiContributor, @NotNull PsiFile file) {
     return null;
   }
+  
+  /**
+   * @return {@code true} if the modifier accepts file indent providers, {@code false} otherwise.
+   */
+  default boolean acceptsFileIndentOptionsProviders() { return false; }
 }

platform/code-style-api/src/com/intellij/psi/codeStyle/modifier/TransientCodeStyleSettings.java

@@ -73,11 +73,15 @@ public final class TransientCodeStyleSettings extends CodeStyleSettings {
 
   @Override
   public @NotNull IndentOptions getIndentOptionsByFile(@NotNull Project project,
-                                                       @Nullable VirtualFile file,
+                                                       @NotNull VirtualFile file,
                                                        @Nullable TextRange formatRange,
                                                        boolean ignoreDocOptions,
                                                        @Nullable Processor<? super FileIndentOptionsProvider> providerProcessor) {
-    if (file != null && file.isValid()) {
+    if (myModifier != null && myModifier.acceptsFileIndentOptionsProviders()) {
+      return super.getIndentOptionsByFile(project, file, formatRange, ignoreDocOptions, providerProcessor);
+    }
+    
+    if (file.isValid()) {
       FileType fileType = file.getFileType();
       return getIndentOptions(fileType);
     }

platform/lang-impl/api-dump-experimental.txt

@@ -802,6 +802,7 @@ f:com.intellij.platform.ide.documentation.ActionsKt
 *f:com.intellij.psi.codeStyle.DetectableIndentSettingsModifier
 - com.intellij.psi.codeStyle.modifier.CodeStyleSettingsModifier
 - <init>():V
+- acceptsFileIndentOptionsProviders():Z
 - getDisablingFunction(com.intellij.openapi.project.Project):java.util.function.Consumer
 - getName():java.lang.String
 - getStatusBarUiContributor(com.intellij.psi.codeStyle.modifier.TransientCodeStyleSettings):com.intellij.psi.codeStyle.modifier.CodeStyleStatusBarUIContributor

platform/lang-impl/src/com/intellij/psi/codeStyle/DetectableIndentSettingsModifier.kt

@@ -35,4 +35,6 @@ class DetectableIndentSettingsModifier : CodeStyleSettingsModifier {
   override fun getStatusBarUiContributor(transientSettings: TransientCodeStyleSettings): CodeStyleStatusBarUIContributor? = null
 
   override fun mayOverrideSettingsOf(project: Project): Boolean = CodeStyle.getSettings(project).AUTODETECT_INDENTS
+
+  override fun acceptsFileIndentOptionsProviders(): Boolean = true
 }