bugfix: Fix issue with not adding | in the last line (#7880)

Fixes #7873

Author: tgodzik

metals/src/main/scala/scala/meta/internal/metals/formatting/MultilineString.scala

@@ -290,8 +290,18 @@ case class MultilineString(userConfig: () => UserConfiguration)
             Some(textEdit)
         }
       case _ =>
-        val isFirstLineOfMultiLine = lineText.trim.contains("\"\"\"")
-        if (isFirstLineOfMultiLine) {
+        val isBeforeOpeningQuotes = lineText.indexOf("\"\"\"") match {
+          case -1 => false
+          case idx =>
+            val lastQuote = idx + 3
+            lineText.indexOf("stripMargin", lastQuote) match {
+              case -1 =>
+                !lines.lift(line + 1).exists(_.trim.startsWith(".stripMargin"))
+              case _ => false
+            }
+        }
+
+        if (isBeforeOpeningQuotes) {
           None
         } else {
           val newText = defaultIndent + "|"

tests/unit/src/test/scala/tests/rangeFormatting/MultilineStringRangeFormattingWhenPastingSuite.scala

@@ -343,4 +343,36 @@ class MultilineStringRangeFormattingWhenPastingSuite
         |}""".stripMargin,
   )
 
+  check(
+    "paste-after-pipe",
+    s"""|object Main {
+        |  val x = '''|@@'''.stripMargin
+        |}""".stripMargin,
+    s"""|Some
+        |multiline
+        |text""".stripMargin,
+    s"""|object Main {
+        |  val x = '''|Some
+        |             |multiline
+        |             |text'''.stripMargin
+        |}""".stripMargin,
+  )
+
+  check(
+    "paste-after-pipe2",
+    s"""|object Main {
+        |  val x = '''|@@'''
+        |  .stripMargin
+        |}""".stripMargin,
+    s"""|Some
+        |multiline
+        |text""".stripMargin,
+    s"""|object Main {
+        |  val x = '''|Some
+        |             |multiline
+        |             |text'''
+        |  .stripMargin
+        |}""".stripMargin,
+  )
+
 }