[TextField] Make collapsed hint aligned with prefix and suffix text

The original logic prevents displaying the collapsed hint on top of suffix text. The behavior looks not consistent with the case of prefix text or outline variants of text fields.

This CL also fixes the issue that when drawable paddings are set on EditText, the collapsed hint is not aligned with the prefix anymore.

Resolves #2800

PiperOrigin-RevId: 511390069

Author: drchen

lib/java/com/google/android/material/textfield/EndCompoundLayout.java

@@ -737,6 +737,21 @@ void updateSuffixTextViewPadding() {
         textInputLayout.editText.getPaddingBottom());
   }
 
+  int getSuffixTextEndOffset() {
+    int endIconOffset;
+    if (isEndIconVisible() || isErrorIconVisible()) {
+      endIconOffset =
+          endIconView.getMeasuredWidth()
+              + MarginLayoutParamsCompat.getMarginStart(
+              (MarginLayoutParams) endIconView.getLayoutParams());
+    } else {
+      endIconOffset = 0;
+    }
+    return ViewCompat.getPaddingEnd(this)
+        + ViewCompat.getPaddingEnd(suffixTextView)
+        + endIconOffset;
+  }
+
   @Nullable
   CheckableImageButton getCurrentEndIconView() {
     if (isErrorIconVisible()) {

lib/java/com/google/android/material/textfield/StartCompoundLayout.java

@@ -328,6 +328,21 @@ void updatePrefixTextViewPadding() {
         editText.getCompoundPaddingBottom());
   }
 
+  int getPrefixTextStartOffset() {
+    int startIconOffset;
+    if (isStartIconVisible()) {
+      startIconOffset =
+          startIconView.getMeasuredWidth()
+              + MarginLayoutParamsCompat.getMarginEnd(
+                  (MarginLayoutParams) startIconView.getLayoutParams());
+    } else {
+      startIconOffset = 0;
+    }
+    return ViewCompat.getPaddingStart(this)
+        + ViewCompat.getPaddingStart(prefixTextView)
+        + startIconOffset;
+  }
+
   void onHintStateChanged(boolean hintExpanded) {
     this.hintExpanded = hintExpanded;
     updateVisibility();

lib/java/com/google/android/material/textfield/TextInputLayout.java

@@ -2769,35 +2769,37 @@ private Rect calculateCollapsedTextBounds(@NonNull Rect rect) {
         bounds.right = rect.right - editText.getPaddingRight();
         return bounds;
       case BOX_BACKGROUND_FILLED:
-        bounds.left = getLabelLeftBoundAlightWithPrefix(rect.left, isRtl);
+        bounds.left = getLabelLeftBoundAlignedWithPrefixAndSuffix(rect.left, isRtl);
         bounds.top = rect.top + boxCollapsedPaddingTopPx;
-        bounds.right = getLabelRightBoundAlignedWithSuffix(rect.right, isRtl);
+        bounds.right = getLabelRightBoundAlignedWithPrefixAndSuffix(rect.right, isRtl);
         return bounds;
       case BOX_BACKGROUND_NONE:
       default:
-        bounds.left = getLabelLeftBoundAlightWithPrefix(rect.left, isRtl);
+        bounds.left = getLabelLeftBoundAlignedWithPrefixAndSuffix(rect.left, isRtl);
         bounds.top = getPaddingTop();
-        bounds.right = getLabelRightBoundAlignedWithSuffix(rect.right, isRtl);
+        bounds.right = getLabelRightBoundAlignedWithPrefixAndSuffix(rect.right, isRtl);
         return bounds;
     }
   }
 
-  private int getLabelLeftBoundAlightWithPrefix(int rectLeft, boolean isRtl) {
-    int left = rectLeft + editText.getCompoundPaddingLeft();
-    if (getPrefixText() != null && !isRtl) {
-      // Label should be vertically aligned with prefix
-      left = left - getPrefixTextView().getMeasuredWidth() + getPrefixTextView().getPaddingLeft();
+  private int getLabelLeftBoundAlignedWithPrefixAndSuffix(int rectLeft, boolean isRtl) {
+    if (!isRtl && getPrefixText() != null) {
+      return rectLeft + startLayout.getPrefixTextStartOffset();
     }
-    return left;
+    if (isRtl && getSuffixText() != null) {
+      return rectLeft + endLayout.getSuffixTextEndOffset();
+    }
+    return rectLeft + editText.getCompoundPaddingLeft();
   }
 
-  private int getLabelRightBoundAlignedWithSuffix(int rectRight, boolean isRtl) {
-    int right = rectRight - editText.getCompoundPaddingRight();
-    if (getPrefixText() != null && isRtl) {
-      // Label should be vertically aligned with prefix if in RTL
-      right += getPrefixTextView().getMeasuredWidth() - getPrefixTextView().getPaddingRight();
+  private int getLabelRightBoundAlignedWithPrefixAndSuffix(int rectRight, boolean isRtl) {
+    if (!isRtl && getSuffixText() != null) {
+      return rectRight - endLayout.getSuffixTextEndOffset();
+    }
+    if (isRtl && getPrefixText() != null) {
+      return rectRight - startLayout.getPrefixTextStartOffset();
     }
-    return right;
+    return rectRight - editText.getCompoundPaddingRight();
   }
 
   @NonNull