IssueTracker

=======================
===== DESCRIPTION =====
=======================

Consider the following vector drawable:

```
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24">
    <path
        android:fillColor="#f00"
        android:pathData="M 0 0 h 12 v 12 h -12 v -12 z" />
    <path
        android:pathData="M 4 4 h 12 v 12 h -12 v -12 z"
        android:strokeWidth="3">
        <aapt:attr name="android:fillColor">
            <gradient
                android:endX="14.0"
                android:endY="14.0"
                android:startX="6.0"
                android:startY="6.0"
                android:type="linear">
                <item
                    android:color="#0f0"
                    android:offset="0" />
                <item
                    android:color="#00f"
                    android:offset="1" />
            </gradient>
        </aapt:attr>
        <aapt:attr name="android:strokeColor">
            <gradient
                android:endX="14"
                android:endY="14"
                android:startX="6"
                android:startY="6"
                android:type="linear">
                <item
                    android:color="#000"
                    android:offset="0" />
                <item
                    android:color="#fff"
                    android:offset="1" />
            </gradient>
        </aapt:attr>
    </path>
    <path
        android:fillColor="#0ff"
        android:pathData="M 14 14 h 8 v 8 h -8 v -8 z"
        android:strokeWidth="2"
        android:strokeColor="#ff0" />
</vector>
```


=============================
===== EXPECTED BEHAVIOR =====
=============================

The vector is correctly rendered on API 28 (see the vector-drawable-gradient-bug-api28.png attachment).

===========================
===== ACTUAL BEHAVIOR =====
===========================

The vector is incorrectly rendered on API 22 (see the vector-drawable-gradient-bug-api22.png attachment).

=======================
===== SOURCE CODE =====
=======================

I believe the issue is in the following source code: https://github.com/aosp-mirror/platform_frameworks_support/blob/097f67f96b7fcede3fe803625f71dc7efa206f92/graphics/drawable/static/src/main/java/androidx/vectordrawable/graphics/drawable/VectorDrawableCompat.java#L1316-L1369

Specifically, if the fill/stroke is NOT a gradient, we need to set the fill/stroke paint's shader back to null so that it doesn't continue to use a shader used by a previous vector drawable path.

======================
===== OTHER INFO =====
======================

Tested using 'androidx.appcompat:appcompat:1.0.0' on API 22 and API 28.

I've attached a sample project that can be used to reproduce the issue to this bug report.

Please assign this bug to Nick Butcher (nickbutcher@google.com) as I know he was the one who wrote the backported vector drawable gradient code.