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This PR entails making the modal barrier behind the Material Drawer dismissible / non-dismissible via a Scaffold flag named "drawerBarrierDismissible", as in: ``` Scaffold( drawerBarrierDismissible: false, // defaults to true so it behaves as normal .... ) ``` This is so as to force the Drawer to be opened / closed programmatically using either: ``` Scaffold.of(context).openEndDrawer() / openDrawer() ``` or ``` Scaffold.of(Utils.adminNav.currentContext!).closeDrawer() / closeEndDrawer() ``` and the user not closing the Drawer upon tapping on the modal barrier. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. --------- Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com> Co-authored-by: Justin McCandless <justinjmccandless@gmail.com>