Tried making a small little project to get accustomized to the GMS2 sprite editor, almost instantly started running into bugs.
1: Clicking the active colors to change them eventually starts pre-loading the wrong color. (After doodling around for a couple of minutes)
2: The Alpha, Red, Green and Blue selection arrows (see above screenshot) jitter completely randomly when I try adjusting them by dragging them, and clicking along their sliders does not move the arrow there: you need to input values using the digit fields.
3: You also can't seem to hover over one of the sliders and use the mouse wheel to move them, that's a pretty nice feature for small adjustments. (Less important than having the sliders actually work, though)
4: I really miss having an alpha slider right below the LMB/RMB colors for when you draw lots of transparent stuff. Not too big of an issue with the new color picker, though.
5: Drawing transparent filled rectangles doesn't work as intended, you get an outline with twice the desired alpha around them. This means you can't use semi-transparent rectangles to shade pre-existing sprites, and could make it tedious to draw semi transparent things like windows. Since it's easier to add the outline yourself using the outlined rectangle tool than to remove an outline you didn't want, and since the tool implies that the rectangle is filled uniformly, this should go.
1: Clicking the active colors to change them eventually starts pre-loading the wrong color. (After doodling around for a couple of minutes)
2: The Alpha, Red, Green and Blue selection arrows (see above screenshot) jitter completely randomly when I try adjusting them by dragging them, and clicking along their sliders does not move the arrow there: you need to input values using the digit fields.
3: You also can't seem to hover over one of the sliders and use the mouse wheel to move them, that's a pretty nice feature for small adjustments. (Less important than having the sliders actually work, though)
4: I really miss having an alpha slider right below the LMB/RMB colors for when you draw lots of transparent stuff. Not too big of an issue with the new color picker, though.
5: Drawing transparent filled rectangles doesn't work as intended, you get an outline with twice the desired alpha around them. This means you can't use semi-transparent rectangles to shade pre-existing sprites, and could make it tedious to draw semi transparent things like windows. Since it's easier to add the outline yourself using the outlined rectangle tool than to remove an outline you didn't want, and since the tool implies that the rectangle is filled uniformly, this should go.