Description:
 The lowest character spacing is -2.0 pt, so if I open a document containing 2 characters with lower spacing, e.g. -13.0 pt, LibreOffice Writer compels it to be -2.0 pt.

 I saw that in earlier versions, at Format > Character > Position > Spacing, there was a combobox for default, expanded and condensed spacing but now there is no more.

 Enhancing the character spacing would allow me to combine 2 selected characters. For example, in Microsoft Word with Cambria Math 12 pt and character spacing -13.0 pt (also known as condensed 13.0 pt) you can combine symbols U+21E8 and U+2298. The negative spacing required for combining characters may vary depending on which they are.

Steps to Reproduce:
1. Set font Cambria Math, 12 pt.
2. Insert U+21E8.
3. Insert U+2298.
4. Select both characters.
5. Format > Character... > Position > Spacing.
6. Input -13.0 pt in the spinner and apply.

Actual Results:
The spacing is forced to be -2.0 pt, which only joins the characters like ae.

Expected Results:
The spacing becomes -13.0 pt and it looks as a white arrow inside a reversed "do not" sign.


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.3.0.3 (x64) / LibreOffice Community
Build ID: 0f246aa12d0eee4a0f7adcefbf7c878fc2238db3
CPU threads: 4; OS: Windows 10.0 Build 19043; UI render: Skia/Raster; VCL: win
Locale: es-AR (es_AR); UI: es-ES
Calc: threaded