Previously SpinBox did not update on return or changes to the editor.
The widget had to lose focus or be manually incremented. This lets
the editor update on return and now always displays the most recent
clamped value. set_value_from_current_text() will also be useful to
programmatically set SpinBox within layouts whose default buttons
consume return key presses.
This is a helpful option to prevent unwanted side effects, distinguish
between user and programmatic input, etc. Sliders and SpinBoxes were
implementing it idiosyncratically, so let's generalize the API and
give Buttons and TextEditors the same ability.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
