Need an image import drag-n-drop system.

[xStrom]

Currently there is no good way to open multiple files from Explorer in a single Slark instance. [1]
Taking the following steps would greatly improve the situation.

• Add ability to drag-n-drop image files from Explorer into the current Slark project.
• Add ability to drag-n-drop image files from one Slark instance to another.

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[1] There is now inter-process communication in Slark that enables opening multiple files in a single instance.