Description:
There are actually two ways to apply a shadow to a text: doing it on the characters or to the whole text box.

In both cases what happens for regular text is that it is duplicated on a diagonal but using a different color (customizable) and putting the copy behind the original text.

If you insert an emoji among the characters (👉📱🎁👑🎉 for instance), LO behaves similarly but not properly in the same way: it duplicates the icon but doesn't grey it's shape.

Steps to Reproduce:
1. Open Draw or Impress;
2. Create a Text Box and write some text, then insert also some emojis (you can copy from here 👉📱🎁👑🎉 and paste them);
3. Select the whole text (or the box) and apply the shadow.

Actual Results:
The icons are just duplicated, not greyed (or colored as specified)

Expected Results:
The software should somehow detect the icons shape and just fill it with the desired shadow color.


Reproducible: Always


User Profile Reset: No

Additional Info:
Version: 7.6.6.3 (X86_64) / LibreOffice Community
Build ID: 60(Build:3)
CPU threads: 8; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: it-IT (it_IT.UTF-8); UI: en-US
Ubuntu package version: 4:7.6.6-0ubuntu0.20.04.1~lo1
Calc: threaded