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SettingsWindow now notices if the window is marked as modified, and
shows a confirmation pop-up to check if the user wants to apply or
discard their changes. It automatically marks the window as unmodified
after restoring defaults or applying the changes, but each Tab subclass
needs to call `set_modified(true)` when the user modifies things.
The "Apply" button is automatically disabled when there are no unsaved
changes to be applied.
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Similar to SystemMonitor's option of the same name, this allows you to
launch the given application with the specific tab open.
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This gives us a convenient way to refer to them, which will be used in
the following commit.
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https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules
"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."
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In order to propagate errors that occur during UI setup, we have to move
all that logic out of widget/window subclass constructors. This is a
first attempt at doing that, for GUI::SettingsWindow.
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This allows us to use TRY() when creating settings UI.
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Some settings tabs, like the ones on the upcoming terminal settings,
need to know when the cancel button is pressed to clean up things like
temporary live updates. Therefore, the SettingsWindow::Tab now features
a cancel_settings callback which does not need to be implemented.
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The FooSettings apps have quite a lot of boilerplate just around
creating a tabbed window with the same styling and the same row of
buttons along the bottom. So, let's extract that out into a class we can
reuse! :^)
You create a SettingsWindow instead of a regular Window, passing a title
and a flag to determine if a "Defaults" button is shown. Then call
add_tab() to add tabs to it. Tabs are widgets extending
SettingsWindow::Tab, which has methods for saving and resetting the
values.
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