Fix multi-line split inline code background drawing (#7875)

In the new timeline renderer, the line end position is sometimes incorrectly returned when you pass the offset of the last character in the line, returning `0.0f`.

This caused the shape to draw for the line to be reversed, where the start was `0.0f` and the end was the actual start.

When we detect a `0.0f` returned value for this,  just get the coordinates for the end of the line instead.

libraries/htmlrenderer/api/src/main/kotlin/io/element/android/libraries/htmlrenderer/api/ui/HtmlMessageContent.kt

@@ -70,6 +70,7 @@ import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.buildAnnotatedString
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.rememberTextMeasurer
+import androidx.compose.ui.text.style.ResolvedTextDirection
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.Density
 import androidx.compose.ui.unit.Dp
@@ -513,7 +514,7 @@ private fun Modifier.drawInlineCodeBackgrounds(
             val lineEnd = minOf(range.end, layout.getLineEnd(line, visibleEnd = true))
             if (lineEnd <= lineStart) continue
             val startX = layout.getHorizontalPosition(lineStart, usePrimaryDirection = true)
-            val endX = layout.getHorizontalPosition(lineEnd, usePrimaryDirection = true)
+            val endX = layout.getHorizontalPosition(lineEnd, usePrimaryDirection = true).takeUnless { it == 0f } ?: layout.getLineEndPosition(line)
             val left = minOf(startX, endX) - horizontalPadding
             val right = maxOf(startX, endX) + horizontalPadding
             val topLeft = Offset(left, layout.getLineTop(line))
@@ -540,6 +541,16 @@ private fun Modifier.drawInlineCodeBackgrounds(
     }
 }
 
+private fun TextLayoutResult.getLineEndPosition(line: Int): Float {
+    val lineEnd = getLineEnd(line, visibleEnd = true)
+    val direction = getParagraphDirection(lineEnd)
+    return if (direction == ResolvedTextDirection.Ltr) {
+        getLineRight(line)
+    } else {
+        getLineLeft(line)
+    }
+}
+
 /**
  * Detects taps and long presses on link-annotated ranges ([LINK_ANNOTATION_TAG]) without consuming the touch events if none are detected, and invokes the
  * appropriate callbacks in [context].