Do special insert even for custom trimIndent() function to avoid using resolve (KT-31810)

idea/src/org/jetbrains/kotlin/idea/editor/KotlinLiteralCopyPasteProcessor.kt

@@ -32,7 +32,6 @@ import org.jetbrains.kotlin.idea.inspections.collections.isCalling
 import org.jetbrains.kotlin.idea.intentions.callExpression
 import org.jetbrains.kotlin.lexer.KotlinLexer
 import org.jetbrains.kotlin.lexer.KtTokens
-import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.KtEscapeStringTemplateEntry
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.KtStringTemplateExpression
@@ -151,13 +150,15 @@ class KotlinLiteralCopyPasteProcessor : CopyPastePreProcessor {
                 res.toString()
             }
         } else {
-            val indent = if (beginTp.firstChild?.text == "\"\"\"" &&
-                beginTp.getQualifiedExpressionForReceiver()?.callExpression?.isCalling(FqName("kotlin.text.trimIndent")) == true
-            ) {
-                begin.parent?.prevSibling?.takeIf { it.text != "\n" }?.text ?: ""
-            } else {
-                ""
-            }            
+            val indent =
+                if (beginTp.firstChild?.text == "\"\"\"" &&
+                    beginTp.getQualifiedExpressionForReceiver()?.callExpression?.calleeExpression?.text == "trimIndent"
+                ) {
+                    begin.parent?.prevSibling?.takeIf { it.text != "\n" }?.text
+                } else {
+                    null
+                } ?: ""
+
             val tripleQuoteRe = Regex("[\"]{3,}")
             TemplateTokenSequence(text).mapIndexed { index, chunk ->
                 when (chunk) {

idea/testData/copyPaste/plainTextLiteral/CustomTrimIndent.expected.kt

@@ -0,0 +1,11 @@
+fun String.trimIndent() = this
+
+fun test() = doTest("""
+    def foo(a)
+        a ? 0 : 1
+    end
+""".trimIndent())
+
+fun doTest(rubyCode: String) {
+    // some code here
+}

idea/testData/copyPaste/plainTextLiteral/CustomTrimIndent.kt

@@ -0,0 +1,10 @@
+fun String.trimIndent() = this
+
+fun test() = doTest("""
+    <caret>
+""".trimIndent())
+
+fun doTest(rubyCode: String) {
+    // some code here
+}
+

idea/testData/copyPaste/plainTextLiteral/CustomTrimIndent.txt

@@ -0,0 +1,3 @@
+def foo(a)
+    a ? 0 : 1
+end

idea/tests/org/jetbrains/kotlin/idea/conversion/copy/LiteralTextToKotlinCopyPasteTestGenerated.java

@@ -34,6 +34,11 @@ public class LiteralTextToKotlinCopyPasteTestGenerated extends AbstractLiteralTe
         runTest("idea/testData/copyPaste/plainTextLiteral/BrokenEntries.txt");
     }
 
+    @TestMetadata("CustomTrimIndent.txt")
+    public void testCustomTrimIndent() throws Exception {
+        runTest("idea/testData/copyPaste/plainTextLiteral/CustomTrimIndent.txt");
+    }
+
     @TestMetadata("MultiLine.txt")
     public void testMultiLine() throws Exception {
         runTest("idea/testData/copyPaste/plainTextLiteral/MultiLine.txt");