Don't start dragging widget below bottom gesture margin

Bug: 215672979
Test: AddConfigWidgetTest
Change-Id: I8121c0662249ec019f4f47a402f7f78655a6b930

tests/tapl/com/android/launcher3/tapl/Widgets.java

@@ -115,6 +115,7 @@ public final class Widgets extends LauncherInstrumentation.VisibleContainer {
             final BySelector labelSelector = By.clazz("android.widget.TextView").text(labelText);
             final BySelector previewSelector = By.res(mLauncher.getLauncherPackageName(),
                     "widget_preview");
+            final int bottomGestureStartOnScreen = mLauncher.getBottomGestureStartOnScreen();
             int i = 0;
             for (; ; ) {
                 final Collection<UiObject2> tableRows = mLauncher.getChildren(widgetsContainer);
@@ -126,6 +127,9 @@ public final class Widgets extends LauncherInstrumentation.VisibleContainer {
                         if (label == null) {
                             continue;
                         }
+                        if (widget.getVisibleCenter().y >= bottomGestureStartOnScreen) {
+                            continue;
+                        }
                         mLauncher.assertEquals(
                                 "View is not WidgetCell",
                                 "com.android.launcher3.widget.WidgetCell",