Add a lower-level EditableText widget

[dweymouth]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

I was looking at the recent Golang reddit post about a Gio-based Postman clone, and OP had mentioned that Gio gave more freedom for designing custom components than Fyne. I took a look at the screenshots and one thing that stood out was the URL bar, with the method selector (GET/POST/etc) - kind of like an Entry with a Select integrated on the left hand side.

This would indeed be a hard/impossible component to build in Fyne, because canvas.Text is too low-level to use as a primitive for that type of component. But if there were a widget (or an option in Entry) to not show the border, but handle everything else editing-related (cursor, selection, etc), you could nest that into a custom widget with the select-like dropdown and drawing a border around it all yourself.

Is it possible to construct a solution with the existing API?

No, other than basically rewriting all of Entry

Describe the solution you'd like to see.

described above

[andydotxyz]

The border colour is set by the theme and with 2.5 the themeoverride makes this possible, I think this should be sufficient.
As our widgets are a standard implementation and designed to be consistent this seems an appropriate balance.

[andydotxyz]

Alternatively a lower level "editable text" component might complement the existing widgets which could be embedded in different scenarios as you indicate would be helpful. There is a lot of functionality in Entry that does not relate to the basic functionality of display and edit text (validation, password etc).

[dweymouth]

I like the idea of an "EditableText" widget. Could be even used in the case where people want a selectable/copyable label for example. Also as a component to build up something like a custom text editor with line number support, etc. Would be a good thing to add at some point in the future.