bug#41645: 27.0.91; Combining Grapheme Joiner (#x34f) gui artifacts

[Pip Cet]

On Mon, Jun 1, 2020 at 4:09 PM David Fussner <dfussner@googlemail.com> wrote:
> Is the patch for master? (Forgive my confusion).

Sorry; I should have sent the right patch for the branch you clearly
specified in the bug report.

The first patch is for master, the second patch applies to master or emacs-27.

The behavior I'm observing with the second patch, on master, is that
there's a zero-width cursor position in between the non-combined
characters: the cursor disappears completely in emacs -Q, except when
the mouse pointer leaves the window, as long as point is on the
character in question.