Fixes #288 - removes unprefixed mask css props

Re-enable this once vscode 1.21 ships

CHANGELOG.md

@@ -12,6 +12,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Fixed
 - Fixes [#276](https://github.com/eamodio/vscode-gitlens/issues/276) - Lookup for branches without upstreams fails
+- Fixes [#274](https://github.com/eamodio/vscode-gitlens/issues/274) - TextEditor is closed/disposed occurs when this extension is enabled
+- Fixes [#288](https://github.com/eamodio/vscode-gitlens/issues/288) - CSS errors on welcome page (mask-* properties)
 
 ## [8.0.0] - 2018-02-07
 ### Added

src/ui/scss/main.scss

@@ -384,9 +384,10 @@ ul {
 
 .icon__info {
     -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 125"><path fill="none" d="M0 0h100v100H0z"/><path d="M50 21a29 29 0 1 0 29 29 29 29 0 0 0-29-29zm0 55a26 26 0 1 1 26-26 26 26 0 0 1-26 26z"/><path d="M48 45l-1 1v18l1 1h4l1-1V46l-1-1zm0-10l-1 1v4l1 1h4l1-1v-4l-1-1z"/></svg>');
-    mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 125"><path fill="none" d="M0 0h100v100H0z"/><path d="M50 21a29 29 0 1 0 29 29 29 29 0 0 0-29-29zm0 55a26 26 0 1 1 26-26 26 26 0 0 1-26 26z"/><path d="M48 45l-1 1v18l1 1h4l1-1V46l-1-1zm0-10l-1 1v4l1 1h4l1-1v-4l-1-1z"/></svg>');
     -webkit-mask-repeat: no-repeat;
-    mask-repeat: no-repeat;
+    // TODO: Uncomment once vscode v1.21 ships
+    // mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 125"><path fill="none" d="M0 0h100v100H0z"/><path d="M50 21a29 29 0 1 0 29 29 29 29 0 0 0-29-29zm0 55a26 26 0 1 1 26-26 26 26 0 0 1-26 26z"/><path d="M48 45l-1 1v18l1 1h4l1-1V46l-1-1zm0-10l-1 1v4l1 1h4l1-1v-4l-1-1z"/></svg>');
+    // mask-repeat: no-repeat;
 }
 
 .icon--lg {
@@ -525,11 +526,12 @@ ul {
         content: '';
         height: 40px;
         -webkit-mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 125"><path d="M50 62a3 3 0 0 1-2-1L26 44a3 3 0 0 1 3-5l21 16 21-16a3 3 0 1 1 3 5L52 61a3 3 0 0 1-2 1z"/></svg>');
-        mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 125"><path d="M50 62a3 3 0 0 1-2-1L26 44a3 3 0 0 1 3-5l21 16 21-16a3 3 0 1 1 3 5L52 61a3 3 0 0 1-2 1z"/></svg>');
         -webkit-mask-repeat: no-repeat;
-        mask-repeat: no-repeat;
+        // TODO: Uncomment once vscode v1.21 ships
+        // mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 125"><path d="M50 62a3 3 0 0 1-2-1L26 44a3 3 0 0 1 3-5l21 16 21-16a3 3 0 1 1 3 5L52 61a3 3 0 0 1-2 1z"/></svg>');
+        // mask-repeat: no-repeat;
+        // mask-size: 32px 40px;
         -webkit-mask-size: 32px 40px;
-        mask-size: 32px 40px;
         position: absolute;
         right: 0;
         top: 0;