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font-lock: limiting anchored match region

From: Marcus Harnisch
Subject: font-lock: limiting anchored match region
Date: Mon, 29 Nov 2021 17:38:49 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.2
PRE-FORM of an anchored matcher allows for extending the match region beyond the end of the current line (which is the default limit). Is there any reason why that limit can't be changed to a position before the end of line? What would be a good workaround? Narrowing the buffer in PRE-FORM, widening in POST-FORM? 

Thanks,
Marcus
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