[TopAppBar][TextField] Remove unneeded logic

After letter spacing is correctly set in CollapsingTextHelper.calculateUsingTextSize(), we no longer need to set letter spacing separately for collapsed and expanded titles. Also this enhances the logic by using textPaint consistently in CollapsingTextHelper.calculateBaseOffsets(), which was not the case before the change. (We got text height from textPaint and text width from tmpPaint.)

PiperOrigin-RevId: 410888232

Author: drchen

lib/java/com/google/android/material/internal/CollapsingTextHelper.java

@@ -712,8 +712,7 @@ private void calculateBaseOffsets(boolean forceRecalculate) {
           TextUtils.ellipsize(textToDraw, textPaint, textLayout.getWidth(), TruncateAt.END);
     }
     if (textToDrawCollapsed != null) {
-      getTextPaintCollapsed(tmpPaint);
-      collapsedTextWidth = measureTextWidth(tmpPaint, textToDrawCollapsed);
+      collapsedTextWidth = measureTextWidth(textPaint, textToDrawCollapsed);
     } else {
       collapsedTextWidth = 0;
     }
@@ -755,8 +754,7 @@ private void calculateBaseOffsets(boolean forceRecalculate) {
     if (textLayout != null && maxLines > 1) {
       expandedTextWidth = textLayout.getWidth();
     } else if (textToDraw != null) {
-      getTextPaintExpanded(tmpPaint);
-      expandedTextWidth = measureTextWidth(tmpPaint, textToDraw);
+      expandedTextWidth = measureTextWidth(textPaint, textToDraw);
     }
     expandedLineCount = textLayout != null ? textLayout.getLineCount() : 0;