Bug fix : Selecting text in login page is causing the input field to be hidden, Fixes AB#3447997 (#2826)

**Problem**: Adding android:background to an Activity theme causes input
text fields to disappear when selected as reported in this bug
https://identitydivision.visualstudio.com/Engineering/_workitems/edit/3383676

**Root Cause**: The android:background attribute sets a background
drawable at the view level, which interferes with EditText's own
background drawable that handles the focus state, underline, and cursor
rendering.

**Solution**: Changed from android:background to
android:windowBackground. The android:windowBackground attribute sets
the background at the window level (behind all views) without affecting
individual view backgrounds, allowing EditText fields to maintain their
focus states and remain visible.
The style now correctly uses android:windowBackground which will set the
white background for the entire activity window without interfering with
input fields' rendering and focus behavior.

Fixes
[AB#3447997](https://identitydivision.visualstudio.com/fac9d424-53d2-45c0-91b5-ef6ba7a6bf26/_workitems/edit/3447997)

Author: somalaya

changelog.txt

@@ -575,6 +575,7 @@ Version 6.0.0
 - [PATCH] Added Base64 encode for the AuthorizationRequest state parameter (#1750)
 - [PATCH] Fix missing authority_url when creating the authority audience (#1753)
 - [PATCH] Add filter for broker telemetry event fields. (#1793)
+- [MINOR] Bug fix : Selecting text in login page is causing the input field to be hidden (#2826)
 
 Version 5.0.1
 ----------

common/src/main/res/values/styles.xml

@@ -60,6 +60,6 @@
     <!-- Theme for DualScreenActivity.
         Force set to a light theme (to status and navigation bars) since broker/common activities always have white background. -->
     <style name="DualScreenActivityTheme" parent="Theme.AppCompat.Light">
-        <item name="android:background">@color/com_microsoft_identity_common_white</item>
+        <item name="android:windowBackground">@color/com_microsoft_identity_common_white</item>
     </style>
 </resources>