Add patch for chalkboard plugin for blur on safari

package/src/common/patches/revealjs-plugin-0001-chakboard-backdrop-filter.patch

@@ -0,0 +1,13 @@
+diff --git a/src/resources/formats/revealjs/plugins/chalkboard/plugin.js b/src/resources/formats/revealjs/plugins/chalkboard/plugin.js
+index 6dfb4b5a5..543ee101f 100644
+--- a/src/resources/formats/revealjs/plugins/chalkboard/plugin.js
++++ b/src/resources/formats/revealjs/plugins/chalkboard/plugin.js
+@@ -444,6 +444,8 @@ const initChalkboard = function ( Reveal ) {
+ 			container.style.visibility = 'visible';
+ 			container.style.pointerEvents = 'none';
+ 			container.style['backdrop-filter'] = 'none';
++      // for older safari
++      container.style["-webkit-backdrop-filter"] = "none";
+
+ 			var slides = document.querySelector( '.slides' );
+ 			var aspectRatio = Reveal.getConfig().width / Reveal.getConfig().height;

package/src/common/update-html-dependencies.ts

@@ -387,6 +387,11 @@ export async function updateHtmlDependencies(config: Configuration) {
     },
     true, // true if commit, false otherwise
     false, // no v prefix,
+    // FIXME: Patch waiting for fix upstream to be merged
+    // https://github.com/rajgoel/reveal.js-plugins/pull/184
+    resolvePatches([
+      "revealjs-plugin-0001-chakboard-backdrop-filter.patch"
+    ])
   );
 
   // revealjs-menu
@@ -1123,7 +1128,7 @@ async function updateGithubSourceCodeDependency(
     await unzip(zipFile, working);
 
     await onDownload(working, version);
-    if (patches) await applyGitPatches(patches);
+    if (patches) applyGitPatches(patches);
   } else {
     throw new Error(`${versionEnvVar} is not defined`);
   }

package/src/util/git.ts

@@ -97,28 +97,26 @@ async function clone(workingDir: string, url: string) {
 
 
 export async function applyGitPatches(patches: string[]) {
-  if (!patches) return undefined
+  if (!patches) return undefined;
   info(`Applying Git patches...`);
-  await Promise.all(
-    patches.map( async (patch) => {
-      info(`  - patch ${colors.blue(patch)}`)
-      const gitCmd: string[] = [];
-      gitCmd.push("git");
-      gitCmd.push("apply");
-      gitCmd.push(patch);
-      // this helps with newline handling in patch
-      gitCmd.push("--ignore-space-change");
-      // this helps debug when patch goes wrong
-      // https://git-scm.com/docs/git-apply#Documentation/git-apply.txt---reject
-      gitCmd.push("--reject");
-      const p = Deno.run({
-        cmd: gitCmd,
-        stderr: "piped",
-      });
-      const status = await p.status();
-      if (status.code !== 0) {
-        throw Error(`Failed to apply patch: '${patch}'`);
-      }
-    })
-  )
+  for (const patch of patches) {
+    info(`  - patch ${colors.blue(patch)}`);
+    const gitCmd: string[] = [];
+    gitCmd.push("git");
+    gitCmd.push("apply");
+    gitCmd.push(patch);
+    // this helps with newline handling in patch
+    gitCmd.push("--ignore-space-change");
+    // this helps debug when patch goes wrong
+    // https://git-scm.com/docs/git-apply#Documentation/git-apply.txt---reject
+    gitCmd.push("--reject");
+    const p = Deno.run({
+      cmd: gitCmd,
+      stderr: "piped",
+    });
+    const status = await p.status();
+    if (status.code !== 0) {
+      throw Error(`Failed to apply patch: '${patch}'`);
+    }
+  }
 }

src/resources/formats/revealjs/plugins/chalkboard/plugin.js

@@ -444,6 +444,8 @@ const initChalkboard = function ( Reveal ) {
 			container.style.visibility = 'visible';
 			container.style.pointerEvents = 'none';
 			container.style['backdrop-filter'] = 'none';
+      // for older safari
+      container.style["-webkit-backdrop-filter"] = "none";
 
 			var slides = document.querySelector( '.slides' );
 			var aspectRatio = Reveal.getConfig().width / Reveal.getConfig().height;