backdrop onPress was firing on non-touchable parts of list.

Author: renrizzolo

lib/sectioned-multi-select.js

@@ -960,8 +960,15 @@ class SectionedMultiSelect extends PureComponent {
           onRequestClose={this._closeSelector}
         >
           <this.BackdropView
-            style={[{ flex: 1, backgroundColor: 'rgba(0,0,0,0.5)' }, styles.backdrop]}
-          >
+            style={[{ 
+              flex: 1, 
+              width: '100%', 
+              height: '100%', 
+              position: 'absolute', 
+              backgroundColor: 'rgba(0,0,0,0.5)',
+              zIndex: 0 
+            }, styles.backdrop]}
+          />
             <View
               style={[
                 {
@@ -1101,7 +1108,6 @@ class SectionedMultiSelect extends PureComponent {
               </View>
               {stickyFooterComponent && callIfFunction(stickyFooterComponent)}
             </View>
-          </this.BackdropView>
         </Modal>
         {chipsPosition === 'top' && this._renderChips()}
         {chipsPosition === 'top' && this._customChipsRenderer()}