Why is it that the font or font size for the entire file changes instead of just the selected area?
Jedit X can handle two types of files, plain text and rich text. Plain text files can save only information related to the text itself, not individual formatting for different sections of text. Therefore, when you change font, size, or text color even for a part of plain text files, the entire file will take on that formatting. Rich text files, however, do allow different formatting elements for different parts of the file, including objects and links. Select Make Rich Text from the Format menu to save individual formatting elements for different parts of your text.