Fixes rendering glitch.

Signed-off-by: Henning Dieterichs <hdieterichs@microsoft.com>

src/vs/editor/browser/viewParts/lines/viewLines.css

@@ -63,7 +63,8 @@
 	width: 100%;
 }
 
-.monaco-editor .view-line > span {
+/* There are view-lines in view-zones. We have to make sure this rule does not apply to them, as they don't set a line height */
+.monaco-editor .lines-content > .view-lines > .view-line > span {
 	bottom: 0;
 	position: absolute;
 }