Fix weird lines appearing in IE with Extension:WikiEditor

IE doesn't like the box-shadow combined with whatever that's doing. And
that box shadow is frivolous enough that it's easier to just kill it
here than figure it out.

Bug: T190991
Change-Id: I46411c3c52db9d21a3df1e9931c78551f626e6c6

resources/screen-misc.less

@@ -56,3 +56,14 @@
 		min-width: @column-right-size;
 	}
 }
+
+// Internet Explorer 10-11
+/* stylelint-disable media-feature-parentheses-space-inside */
+@media screen and (-ms-high-contrast: none), (-ms-high-contrast: active) {
+	/* stylelint-enable media-feature-parentheses-space-inside */
+	// T190991
+	textarea,
+	#searchInput {
+		box-shadow: none;
+	}
+}