Unable to display and manage mixed text styles during selection

[crlaferla]

When a user applies multiple styles (e.g., bold, italics, underline) to a line or multiple lines of text, they should be able to see which styles are applied to the selected text, even if those styles are only applied to portions of the selection. For example, if the text contains mixed styles (e.g., some text is bold, some is bold and italicized, and some is underlined), the applied styles should be dynamically indicated as the user highlights the text, while / even if highlighting occurs from right to left.

Example:
this is example text

If the user highlights text with different styles and selects one (e.g., bold), that style (bold) should be removed from all highlighted text. Other styles (e.g., italics, underline) should remain applied and visibly indicated.