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bug#18417: 24.3.93; posn-at-point confused by fill-column-indicator

From: Alp Aker
Subject: bug#18417: 24.3.93; posn-at-point confused by fill-column-indicator
Date: Sun, 7 Sep 2014 15:52:34 -0400

> There are 2 special characters, u+e000 and u+e001, each one has a
> display-table setting to display it as something else, then there's an
> empty overlay with an after-string made of these special characters
> that has a display property with :align-to, followed by an image...
> And I'm not sure I listed all of the "features".  (The 'cursor'
> property I omitted intentionally, because I believe I know why they
> are needed.)  Why each one of these is needed?

At least some of that is cruft, as at one point I was trying to support all of v22, v23, and v24, and there were various differences in the behavior of overlay-strings (as well as the 'cursor property) among those versions.  I'll try to simplify the implementation and see if I can come up with something that doesn't trigger any UB in the display engine.

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