Fix height of an empty line

SkiaParagraph doesn't use span style to determine the height of the empty/blank line. It uses main style of the paragraph, which we haven't set.

Fixes JetBrains/compose-multiplatform#1781

# Conflicts:
#	compose/ui/ui-text/src/skikoMain/kotlin/androidx/compose/ui/text/platform/SkiaParagraph.skiko.kt

compose/ui/ui-text/src/desktopTest/kotlin/androidx/compose/ui/text/DesktopParagraphTest.kt

@@ -317,6 +317,19 @@ class DesktopParagraphTest {
         Truth.assertThat(paragraphWithoutStyles.getLineBottom(1)).isNotEqualTo(secondLineBottom)
     }
 
+    @Test
+    fun `line heights`() {
+        val paragraph = simpleParagraph(
+            text = "aaa\n\naaa\n\n\naaa\n   \naaa",
+            style = TextStyle(fontSize = 50.sp)
+        )
+        val firstLineHeight = paragraph.getLineHeight(0)
+
+        for (i in 1 until paragraph.lineCount) {
+            Truth.assertThat(paragraph.getLineHeight(i)).isEqualTo(firstLineHeight)
+        }
+    }
+
     private fun simpleParagraph(
         text: String = "",
         style: TextStyle? = null,