Previously, we were rewriting the on_primary_color_change in the Text
Tool and Gradient, which made the palette widget no longer update after
picking a color from an image. Additionally, it also crashed the program
after leaving the Gradient tool and trying to change color.
This patch adds a new gradient tool to pixelpaint that allows us to fill
the canvas with a smooth color gradient outline at the edge of the
filled area.
Holding shift while using the polygonal select tool now constrains the
line angle in 22.5 degree increments. This matches the behavior of the
line tool.
Previously, all keydown KeyEvents were accepted, causing parent widgets
not to receive them. With the addition of shortcut handling to keydown,
shortcuts were not called when the ImageEditor was focused.
Refactored PickerTool functionality to the ImageEditor level and added a
flag to Tool Base Class to allow for tools to override Alt+Click
ColorPicker functionality
This method is used to point a position at the preferred pixel of
the image. Certain tools may want to specify a different preferred
pixel for the same input position.
