When selecting text to be highlighted, after the text has been highlighted, the highlighting function does not turn off. When typing new text, the text seems to be automatically highlighter (did not want this to happen). When you go to click the highlight button to turn it off, it does not turn off. What I end up having to do is to selct the text that was automatically highlighted and select "no fill" to remove the highlight.
I have confirmed this behavior. Here is how to see the issue:
1. In a new Writer document, begin typing: "This is text to modify"
2. Highlight the word "modify" using your mouse.
3. Click on the highlight feature on the toolbar. This should turn the highlight feature on.
4. After highlighting the word "modify", click the highlight tool, or press ESC.
5. Use spacebar, then keep typing.
Expected Result: Subsequent text is not highlighted. Highlight is "off".
Actual Result: Highlighting continues. Highlight is still "active".
At this point, you will have to use your mouse to highlight the new text, and click the Highlight menu dropdown next to the Highlight feature, and select no fill. Then you can continue to type without the highlight.
Another way to avoid this is to make sure there is a space entered after the word "modify", and use your mouse to highlight everything but the space. Then highlight works as expected.
According to the LibreOffice Help about highlighting, Highlight "Applies the current highlight color to the background of a text selection.". So the behavior might be intentional, because text that extends after "modify" might be considered part of the selection. But I think the text selection should only be considered the actual current selection.
Version: 126.96.36.199+ (Build ID: 3e8af168ca227529b752abb9c7aecc42be4a229)
Platform: Ubuntu Linux x64
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Marking as NEW, ENHANCEMENT. I am not sure if this something that will change, because I think it might be acting according to the documentation. It is certainly worth looking into, though.