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bug#4094: 23.1.50; posn-at-point gets upset by overlays with 'invisible

From: Lennart Borgman
Subject: bug#4094: 23.1.50; posn-at-point gets upset by overlays with 'invisible and 'display
Date: Sun, 9 Aug 2009 21:40:12 +0200

Forgot to say that this seems to be some problem with the interaction
with the display engine and display update. When you try to debug this
the problem is sometimes gone.

On Sun, Aug 9, 2009 at 9:38 PM, Lennart
Borgman<address@hidden> wrote:
> Some more thoughts: There seem to be several small inconsistencies
> around here. I guess the intended behaviour is
> For invisible overlays (and dito buffer text, but it is overlays I
> have been looking at now):
> - The "stop" point on the display string property should be the first
> character. That seems to be the case now, but often the first char is
> missed/jumped over, see below.
> - When calling forward-char or backward char they should stop there.
> Forward char often does that, but not always. Backward char does not
> seem to do that.
> - Similar problem with vertical-motion. It often misses the first char
> and goes to the column after the display string instead.

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