Set relatesToPrecedingText flag when adding hints

Fixes #KTIJ-3768

(cherry picked from commit a02e88cc51b43bd03214f5ee713fb67fb992fc6a)

IJ-MR-7775

GitOrigin-RevId: 569b0e1909d2ad4b0f86055be1f21dd9f326b2e2

platform/lang-impl/src/com/intellij/codeInsight/hints/InlayHintsPass.kt

@@ -120,10 +120,11 @@ class InlayHintsPass(
         val renderer = InlineInlayRenderer(entry.value)
 
         val toBePlacedAtTheEndOfLine = entry.value.any { it.constraints?.placedAtTheEndOfLine ?: false }
+        val isRelatedToPrecedingText = entry.value.all { it.constraints?.relatesToPrecedingText ?: false }
         val inlay = if (toBePlacedAtTheEndOfLine) {
           inlayModel.addAfterLineEndElement(entry.intKey, true, renderer)
         } else {
-          inlayModel.addInlineElement(entry.intKey, renderer) ?: break
+          inlayModel.addInlineElement(entry.intKey, isRelatedToPrecedingText, renderer) ?: break
         }
 
         inlay?.let { postprocessInlay(it) }

platform/lang-impl/testSources/com/intellij/codeInsight/hints/InlayPassTest.kt

@@ -54,6 +54,40 @@ class InlayPassTest : BasePlatformTestCase() {
     assertEquals(2, extractContent(inlays, 1))
   }
 
+  fun testInlaysRespectHorizontalConstraints() {
+    createPass(listOf(createOneOffCollector {
+      it.addInlineElement(1, true, TestRootPresentation(1), true)
+      it.addInlineElement(2, true, TestRootPresentation(2), false)
+      it.addInlineElement(3, false, TestRootPresentation(3), false)
+    })).collectAndApply()
+    var inlays = inlineElements
+    assertEquals(2, inlays.size)
+    assertTrue(inlays[0].isRelatedToPrecedingText)
+    assertFalse(inlays[1].isRelatedToPrecedingText)
+    inlays = afterLineEndElements
+    assertEquals(1, inlays.size)
+  }
+
+  fun testInlaysAtSameOffsetWithMatchingRelatesToPrecedingText() {
+    createPass(listOf(createOneOffCollector {
+      it.addInlineElement(1, true, TestRootPresentation(1), false)
+      it.addInlineElement(1, true, TestRootPresentation(2), false)
+    })).collectAndApply()
+    val inlays = inlineElements
+    assertEquals(1, inlays.size)
+    assertTrue(inlays[0].isRelatedToPrecedingText)
+  }
+
+  fun testInlaysAtSameOffsetWithDifferentRelatesToPrecedingTextDefaultToFalse() {
+    createPass(listOf(createOneOffCollector {
+      it.addInlineElement(1, true, TestRootPresentation(1), false)
+      it.addInlineElement(1, false, TestRootPresentation(2), false)
+    })).collectAndApply()
+    val inlays = inlineElements
+    assertEquals(1, inlays.size)
+    assertFalse(inlays[0].isRelatedToPrecedingText)
+  }
+
   fun testPresentationUpdated() {
     createPass(listOf(
       createOneOffCollector {
@@ -161,6 +195,9 @@ class InlayPassTest : BasePlatformTestCase() {
   private val inlineElements: List<Inlay<*>>
     get() = inlayModel.getInlineElementsInRange(0, myFixture.file.textRange.endOffset)
 
+  private val afterLineEndElements: List<Inlay<*>>
+    get() = inlayModel.getAfterLineEndElementsInRange(0, myFixture.file.textRange.endOffset)
+
   private val allHintsCount: Int
     get() = inlineElements.size + blockElements.size
 }