fix: dm room title ascenders clipping subtitle

On user rooms with RPC enabled, room titles (the username e.g. 'greg') with ascenders (e.g. 'g') are cut off from the subtitle below.

Author: hazzuk

res/css/views/rooms/_RoomRPC.pcss

@@ -6,14 +6,24 @@ Please see LICENSE files in the repository root for full details.
 */
 
 .mx_RoomRPC {
+    /* hide text overflow on hover */
     display: contents;
 
+    /* crop icon to circle */
     img {
         border-radius: 50%;
     }
 }
 
+/* adjust subtitle down */
 .mx_RoomTile_dm
 .mx_RoomTile_subtitle {
     top: 0px !important;
 }
+
+/* fix dm room title ascenders clipping subtitle */
+.mx_RoomTile_titleWithSubtitle {
+    margin-bottom: -0.2em;
+    overflow: visible;
+    mask-image: linear-gradient(to bottom, #000 85%, transparent 100%);
+}