Add prominent tooltip for region Ctrl modifier
## Submitted by Yousuf Philips `@philipzae` Assigned to **Xfce Bug Triage** **[Link to original bug (#16513)](https://bugzilla.xfce.org/show_bug.cgi?id=16513)** ## Description Only after watching the screenshot animation on the 4.14 tour page did I learn that the region option has the ability using Ctrl to move the selection around and in order to make this more discoverable, a tooltip needs to be added to the dialog.
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