[AA] KtExpressionInfoProvider.getMissingCases: fix no subject case

return missing else branch (even if it's present, see kdoc)

^ KT-62875 fixed

analysis/analysis-api-fe10/tests-gen/org/jetbrains/kotlin/analysis/api/fe10/test/cases/generated/cases/components/expressionInfoProvider/Fe10IdeNormalAnalysisSourceModuleWhenMissingCasesTestGenerated.java

@@ -58,6 +58,24 @@ public class Fe10IdeNormalAnalysisSourceModuleWhenMissingCasesTestGenerated exte
         runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_empty.kt");
     }
 
+    @Test
+    @TestMetadata("boolean_noSubject.kt")
+    public void testBoolean_noSubject() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubjectIncorrectCode.kt")
+    public void testBoolean_noSubjectIncorrectCode() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubjectIncorrectCode.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubject_else.kt")
+    public void testBoolean_noSubject_else() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject_else.kt");
+    }
+
     @Test
     @TestMetadata("boolean_partial.kt")
     public void testBoolean_partial() throws Exception {

analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/components/expressionInfoProvider/FirIdeDependentAnalysisSourceModuleWhenMissingCasesTestGenerated.java

@@ -58,6 +58,24 @@ public class FirIdeDependentAnalysisSourceModuleWhenMissingCasesTestGenerated ex
         runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_empty.kt");
     }
 
+    @Test
+    @TestMetadata("boolean_noSubject.kt")
+    public void testBoolean_noSubject() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubjectIncorrectCode.kt")
+    public void testBoolean_noSubjectIncorrectCode() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubjectIncorrectCode.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubject_else.kt")
+    public void testBoolean_noSubject_else() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject_else.kt");
+    }
+
     @Test
     @TestMetadata("boolean_partial.kt")
     public void testBoolean_partial() throws Exception {

analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/components/expressionInfoProvider/FirIdeNormalAnalysisSourceModuleWhenMissingCasesTestGenerated.java

@@ -58,6 +58,24 @@ public class FirIdeNormalAnalysisSourceModuleWhenMissingCasesTestGenerated exten
         runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_empty.kt");
     }
 
+    @Test
+    @TestMetadata("boolean_noSubject.kt")
+    public void testBoolean_noSubject() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubjectIncorrectCode.kt")
+    public void testBoolean_noSubjectIncorrectCode() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubjectIncorrectCode.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubject_else.kt")
+    public void testBoolean_noSubject_else() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject_else.kt");
+    }
+
     @Test
     @TestMetadata("boolean_partial.kt")
     public void testBoolean_partial() throws Exception {

analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/components/expressionInfoProvider/FirStandaloneNormalAnalysisSourceModuleWhenMissingCasesTestGenerated.java

@@ -58,6 +58,24 @@ public class FirStandaloneNormalAnalysisSourceModuleWhenMissingCasesTestGenerate
         runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_empty.kt");
     }
 
+    @Test
+    @TestMetadata("boolean_noSubject.kt")
+    public void testBoolean_noSubject() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubjectIncorrectCode.kt")
+    public void testBoolean_noSubjectIncorrectCode() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubjectIncorrectCode.kt");
+    }
+
+    @Test
+    @TestMetadata("boolean_noSubject_else.kt")
+    public void testBoolean_noSubject_else() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject_else.kt");
+    }
+
     @Test
     @TestMetadata("boolean_partial.kt")
     public void testBoolean_partial() throws Exception {

analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/components/KtExpressionInfoProvider.kt

@@ -36,6 +36,15 @@ public interface KtExpressionInfoProviderMixIn : KtAnalysisSessionMixIn {
      *   else -> 3
      * }
      *
+     * If when-expression has no subject, then else-branch would be reported as missing even if it is explicitly present:
+     *
+     * fun test() {
+     *     when {
+     *         true -> {}
+     *         else -> {}
+     *     }
+     * }
+     *
      * Note that this function returns the same missing cases regardless of the existence of the else branch.
      * If you have to assume that it does not have the missing cases when it has an else branch,
      * you need a separate check whether it has an else branch or not.

analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject.kt

@@ -0,0 +1,5 @@
+fun test() {
+    <caret>when {
+        true -> {}
+    }
+}

analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject.txt

@@ -0,0 +1 @@
+Unknown - else

analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubjectIncorrectCode.kt

@@ -0,0 +1,5 @@
+fun test() {
+    <caret>when() {
+        true -> {}
+    }
+}

analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubjectIncorrectCode.txt

@@ -0,0 +1 @@
+Unknown - else

analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject_else.kt

@@ -0,0 +1,6 @@
+fun test() {
+    <caret>when {
+        true -> {}
+        else -> { }
+    }
+}

analysis/analysis-api/testData/components/expressionInfoProvider/whenMissingCases/boolean_noSubject_else.txt

@@ -0,0 +1 @@
+Unknown - else