Decker 1.15

Decker v1.15 is a maintenance release with bugfixes and several performance enhancements.

Fixes (Web and Native):

• The thumb of slider widgets will now shrink appropriately if the track is smaller than 16 pixels along the primary axis.
• If the "read[]" function is used to request the frames of a GIF and the user cancels, it will still return a dictionary of (empty) frame and delay lists, for consistency.
• The "canvas.merge[]" function was rewritten for improved performance, which in turn improves the smoothness of many card transition animations on slow machines.

Fixes (Native):

• Corrected a flaw in "image.map[]" with color indices above 127.
• Locked decks no longer interfere with closing the application window.

New Features:

• If a file named "start.deck" is placed in the same directory as the native-decker executable, it will be opened at startup instead of the built-in "guided tour" deck. For details, see https://beyondloom.com/decker/decker.html#startup
• Introduced "image.merge[]", which is equivalent to "canvas.merge[]": tile and composite together one or more images based on the pattern index at each pixel of the original image, modifying the original image in-place.