[DO NOT MERGE] Prevent TextInterpolator from rendering nonprintable newlines

This is a smaller piece of a larger cherry-pick which is being
taken ahead of the full set to resolve merge conflicts in
other work.

Test: Manual
Bug: 229771520
Change-Id: Ibf1396c4570d891439a73dad0909ab05e6c3119a

packages/SystemUI/animation/src/com/android/systemui/animation/TextInterpolator.kt

@@ -485,7 +485,13 @@ class TextInterpolator(
         val out = mutableListOf<List<PositionedGlyphs>>()
         for (lineNo in 0 until layout.lineCount) { // Shape all lines.
             val lineStart = layout.getLineStart(lineNo)
-            val count = layout.getLineEnd(lineNo) - lineStart
+            var count = layout.getLineEnd(lineNo) - lineStart
+            // Do not render the last character in the line if it's a newline and unprintable
+            val last = lineStart + count - 1
+            if (last > lineStart && last < layout.text.length && layout.text[last] == '\n') {
+                count--
+            }
+
             val runs = mutableListOf<PositionedGlyphs>()
             TextShaper.shapeText(layout.text, lineStart, count, layout.textDirectionHeuristic,
                     paint) { _, _, glyphs, _ ->