Fix delegate handle recognition

OpenBoard-org / OpenBoard

OpenBoard is a cross-platform interactive whiteboard application intended for use in a classroom setting.

https://openboard.ch/

GNU General Public License v3.0

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Open letsfindaway opened 4 days ago

letsfindaway commented 4 days ago

This PR fixes #1105:

the handles on a delegate frame may be stacked on each other if the delegate frame is small in one or the other direction
determine tool from mouse position by asking the topmost handle first
use isUnderCursor() to be sure that the tool matches the currently shown cursor
remove unreachable return