[TextInputLayout] Fix editText paddings on pre-Lollipop

Resolves #3583
Resolves #3582

GIT_ORIGIN_REV_ID=356f7488505470656d26b0452dae78ae01475022
PiperOrigin-RevId: 574833205

Author: pubiqq

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

@@ -846,10 +846,30 @@ void updateEditTextBoxBackgroundIfNeeded() {
         || boxBackgroundMode == BOX_BACKGROUND_NONE) {
       return;
     }
-    ViewCompat.setBackground(editText, getEditTextBoxBackground());
+    updateEditTextBoxBackground();
     boxBackgroundApplied = true;
   }
 
+  private void updateEditTextBoxBackground() {
+    Drawable editTextBoxBackground = getEditTextBoxBackground();
+
+    // On pre-Lollipop, setting a LayerDrawable as a background always replaces the original view
+    // paddings with its own, so we preserve the original paddings and restore them after setting
+    // a new background.
+    if (VERSION.SDK_INT < VERSION_CODES.LOLLIPOP
+        && editTextBoxBackground instanceof LayerDrawable) {
+      int paddingLeft = editText.getPaddingLeft();
+      int paddingTop = editText.getPaddingTop();
+      int paddingRight = editText.getPaddingRight();
+      int paddingBottom = editText.getPaddingBottom();
+
+      ViewCompat.setBackground(editText, editTextBoxBackground);
+      editText.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
+    } else {
+      ViewCompat.setBackground(editText, editTextBoxBackground);
+    }
+  }
+
   @Nullable
   private Drawable getEditTextBoxBackground() {
     if (!(editText instanceof AutoCompleteTextView) || isEditable(editText)) {