Bug#450481: [Patch] Improved popup-menu alignment

[Bram Moolenaar]

James -

> When completing a word near the edge of the window, the completion list
> gets truncated if there's not enough room to display the full width.  The
> attached patch adds a condition to the display logic which, if there's
> room, will anchor the right edge of the popup-menu to the cursor
> position instead of the left edge.

Hmm, not sure if this will look right.  The idea is that the completed
word is straight under the replaced word.  And I thought the window was
already moved leftwards to avoid truncation.  Need to look into this,
I'll put it in the todo list.

- Bram

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