fix border painting in presence of inlays

platform/platform-impl/src/com/intellij/openapi/editor/impl/view/EditorPainter.java

@@ -777,8 +777,8 @@ class EditorPainter implements TextDrawingCallback {
           }
         }
         else if (startOffset < maxOffset && endOffset > minOffset) {
-          float x1 = fragment.offsetToX(Math.max(minOffset, startOffset));
-          float x2 = fragment.offsetToX(Math.min(maxOffset, endOffset));
+          float x1 = minOffset == maxOffset ? fragment.getStartX() : fragment.offsetToX(Math.max(minOffset, startOffset));
+          float x2 = minOffset == maxOffset ? fragment.getEndX() : fragment.offsetToX(Math.min(maxOffset, endOffset));
           if (x1 > x2) {
             float tmp = x1;
             x1 = x2;

platform/platform-tests/testSrc/com/intellij/openapi/editor/EditorPaintingTest.java

@@ -116,6 +116,14 @@ public class EditorPaintingTest extends AbstractEditorTest {
     checkResult();
   }
 
+  public void testMultilineBorderWithInlays() throws Exception {
+    initText("abc\ndef");
+    myEditor.getInlayModel().addInlineElement(1, new MyInlayRenderer());
+    myEditor.getInlayModel().addInlineElement(6, new MyInlayRenderer());
+    addBorderHighlighter(0, 7, 0, Color.red);
+    checkResult();
+  }
+
   private static void setUniformEditorHighlighter(TextAttributes attributes) {
     ((EditorEx)myEditor).setHighlighter(new UniformHighlighter(attributes));
   }