
A small update: three fixes for problems in 1.5.0 and earlier, all from your reports. Thank you for sending them.
A light's handle is drawn in the middle of the pixel the light sits on, but a click was tested against that pixel's corner. On large artwork the difference was a fraction of a screen pixel. On pixel art zoomed in, the spot that picked a light up sat above and to the left of its handle, and at the highest zoom a click on the handle missed it altogether. A light also moved half a pixel each time it was picked up. Now a click on the handle picks the light up at any zoom, and it stays where it was until you drag it.
Follow overall form, Flatten interior, the detail methods and a light's Intensity each have a checkbox. Dragging one of their sliders to zero used to switch the setting off and lock the slider, so bringing it back meant ticking the box first. Now the box is the switch and the slider is the amount. Drag to zero and straight back up. Untick the box to switch the setting off, and tick it again to bring it back at the value it had.
On Linux under Proton, the editor could close by itself a few seconds after it opened. It came from the way the window was set up to take dropped files, and the editor now leaves dropped files to the page, as the website does. Thank you to the tester whose logs found it.
If the app is already in your library, Steam will offer this build. Start it from your Steam library. A copy started some other way asks Steam to relaunch it. The About dialog should read 1.5.1.
The knight sprite is from rodrigodmoreira/nmap-generation and is used under the MIT License.