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Bug: Some characters, like 'th' and 'ff', disappear in text strings when map is exported to PDF

Description

Some characters, like 'th' and 'ff', disappear in text strings when map is exported to PDF.

For example, the text string 'Ruffano Path Dr.' displays fine in the map, but when the map is exported to PDF, the string displays as 'Ru ano Pa Dr.'.

Cause

This occurs when the font being used, such as Myriad Pro and Calibri, includes ligatures. A ligature is a single character that replaces two or more other characters.

Consider the following example using the characters ‘ff’ in Myriad Pro:
[O-Image] ff in Myriad Pro
The above is replaced by the following ligature in Myriad Pro, which is one character that has no space between the two arms of the ‘f’ characters:
[O-Image] ff ligature in Myriad Pro

Workaround

Add another text string, colored white, such as 'T h' or 'f f' to the map, so those character glyphs are forced to be included in the font embedding.

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