Add a setting to retrieve bookmark metadata asynchrounously

  - There is a new standalone script (metadata.js) which requests
    a new controller to get bookmark metadata and fill the form async
  - This feature is enabled with the new setting: general.enable_async_metadata
    (enabled by default)
  - general.retrieve_description is now enabled by default
  - A small rotating loader animation has a been added to bookmark inputs
    when metadata is being retrieved (default template)
  - Custom JS htmlentities has been removed and  mathiasbynens/he
    library is used instead

Fixes #1563

1 files changed, 51 insertions, 0 deletions

diff --git a/assets/default/scss/shaarli.scss b/assets/default/scss/shaarli.scss
index a528adb0..df9c867b 100644
--- a/assets/default/scss/shaarli.scss
+++ b/assets/default/scss/shaarli.scss
@@ -1269,6 +1269,57 @@ form {
   }
 }
 
+.loading-input {
+  position: relative;
+
+  @keyframes around {
+    0% {
+      transform: rotate(0deg);
+    }
+
+    100% {
+      transform: rotate(360deg);
+    }
+  }
+
+  .icon-container {
+    position: absolute;
+    right: 60px;
+    top: calc(50% - 10px);
+  }
+
+  .loader {
+    position: relative;
+    height: 20px;
+    width: 20px;
+    display: inline-block;
+    animation: around 5.4s infinite;
+
+    &::after,
+    &::before {
+      content: "";
+      background: $form-input-background;
+      position: absolute;
+      display: inline-block;
+      width: 100%;
+      height: 100%;
+      border-width: 2px;
+      border-color: #333 #333 transparent transparent;
+      border-style: solid;
+      border-radius: 20px;
+      box-sizing: border-box;
+      top: 0;
+      left: 0;
+      animation: around 0.7s ease-in-out infinite;
+    }
+
+    &::after {
+      animation: around 0.7s ease-in-out 0.1s infinite;
+      background: transparent;
+    }
+  }
+}
+
 // LOGIN
 .login-form-container {
   .remember-me {