This is not necessary, as pressing Enter will activate the button
whether it is in focus or not. This makes the equals button behave the
same as all other buttons.
Previously, changing a system theme with Calculator opened made buttons
with custom color not to update to the new theme - the background color
remained from the previous one.
This is because when setting the color, the widget has to copy the
current palette and modify the foreground color there, which means it
will no longer refer to the system theme and any change there will not
happen here.
Using colors from a system palette fixes this issue and makes buttons
look slightly different from what was here before. But that is because
they're now somewhat more integrated with the system themes! :^)
Type | Old color | New color role
---- | --------- | --------------
Numbers | "blue" | SyntaxNumber
Functions (sqrt, %) | "blue" | SyntaxFunction
Operators (+ - * /) | text-default | SyntaxOperator
Backspace, CE and C | "brown" | SyntaxControlKeyword
Memory operators, = | "red" | SyntaxPreprocessorValue
Having the return key sometimes press the equal button when nothing is
focused and press a different button when there is focus felt confusing.
The equal button is still able to be focused for the tab cycle to have
something to go to in order to jump out of the textbox but no other
keypad button can be focused now.
This allows for typing [8] instead of [8, 8, 8, 8] to specify the same
margin on all edges, for example. The constructors follow CSS' style of
specifying margins. The added constructors are:
- Margins(int all): Sets the same margin on all edges.
- Margins(int vertical, int horizontal): Sets the first argument to top
and bottom margins, and the second argument to left and right margins.
- Margins(int top, int vertical, int bottom): Sets the first argument to
the top margin, the second argument to the left and right margins,
and the third argument to the bottom margin.
