D13450: Add arrow keys to move and resize selection rectangle

[Scott Harvey]

sharvey added inline comments.

INLINE COMMENTS

> rkflx wrote in EditorRoot.qml:41
> That does not seem right, because this will result in slower movement on a HiDPI screen compared to a regular screen of the same size. (It's needed for the 1px case, of course.)

This was suggested by @abalaji based on his work on reworking the selection rectangle. Should it be removed?

REPOSITORY
  R166 Spectacle

REVISION DETAIL
  https://phabricator.kde.org/D13450

To: sharvey, rkflx, ngraham, #spectacle, yurchor
Cc: ltoscano, kde-doc-english, abalaji, #spectacle, skadinna
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