On touch devices, the color pipette tool could easilly be
immediately dismissed due to the 'button up' event happening
right where the "Back" dismissal/cancel button appeared.
Now only pays attention to 'release' if the button was down.
(h/t Pere for reporting this)
On my laptop the prompt was basically not coming up at all
(only one animation step every few seconds), because apparently
it was stuck doing "w += 0" due to how few ticks went by within
the loop! :-D
We'll end up with things like "132/245 red, 90/245 yellow, 23/245 blue".
Getting it to work will likely require some massive brute-forcing.
If people want to take an existing color and make subtle changes, they
can just use the rainbow palette HSV color picker.
More sensible rotation when using the drag-from-corner mode
(rotates around center of the shape, as you'd expect, rather than
around one of the corners of the shape's bounding box, as it has
been doing all this time).
Stretching a shape from bottom to top causes an upside-down shape
(e.g., before, a triangle would always start out up-pointing
regardless as to whether you clicked and drag downwards or upwards;
now, it will start out down-pointing if you drag upwards when
initially placing & stretching the shape).
...deactivate all code for this within color mixer, since it's
not actually implemented yet (going to be tricky! -- probably
holding off to a future version).
Also, sound effect for cross-color grabbing within rainbow palette
dialog.
Locking to 0-degrees when mouse is within a UI-button-sized
square centered around the stamp's center (h/t Pere for the idea).
Change mouse pointer to 'hand' when in the center (so at the start
of the rotation step), and to the 'circle arrow' rotation symbol
when actually rotating.
WIP (disabled for now) Drawing a XOR'd line out of the stamp's
center to the mouse, to show the angle you're rotating at.
(Needs more work to avoid leaving residuals on the screen.)
