Chore: Replace `flutter-quill` with `visual-editor`

[nelsonic]

As noted by @LuchoTurtle in singerdmx/flutter-quill#1389 a brick wall was hit in terms of testing with flutter-quill. 🧱 😢

Therefore we need to:

• Switch this tutorial to using visual-editor as fast as possible, ideally in less than a day.
• Please leave regular comment updates on this issue or your Pull Request so that it's clear when you are having difficulty.

This should be straightforward as visual-editor is a fork of flutter-quill so there should be significant overlap/similarity.
If there is a lot of divergence, and it's not a "find and replace" job, please leave comments! 💬 🙏

[LuchoTurtle]

I'm trying to install visual-editor but I'm getting an error resolving dependencies:

Resolving dependencies... (1.8s)
Because no versions of mockito match >5.4.2 <6.0.0 and mockito 5.4.2 depends on analyzer ^5.11.0, mockito ^5.4.2 requires analyzer ^5.11.0.
And because every version of visual_editor from git depends on i18n_extension ^4.2.1 which depends on analyzer ^3.0.0, mockito ^5.4.2 is incompatible with visual_editor from git.
So, because app depends on both visual_editor from git and mockito ^5.4.2, version solving failed.

I'm using mockito just as a dev dependency. But nonetheless, the package i18n_extension that visual-editor uses should be upgraded so version solving succeeds 💭

Created issue on visual-space/visual-editor#234

[nelsonic]

Definitely open that issue on the project repo and propose the update. 👌

[LuchoTurtle]

Just going to give an update on this issue. The reason it's not been migrated yet is because the visual_editor was using outdated dependencies get resulting in dependency versioning errors when trying to install.

The example of the package was only working on an older version of Flutter, which is not desirable because it would break versioning on our app.

This is why the following issues and updates have been opened, linked here and occured in the following:

• Sys - Upgrade to latest Flutter/Dart 3, Update libs visual-space/visual-editor#234

• chore: Removing deprecated methods and upgrading Flutter visual-space/visual-editor#235

• Sys - Updating dependencies visual-space/visual-editor#236

I'm practically done with the PR that updates the dependencies that should hopefully fix my blocker when installing and migrating flutter_quill to visual_editor.

I haven't opened the PR yet because, as per visual_editor's guidelines, it's one commit per PR. I need to do some final tests to make sure their example app works fine as before (it does on both iOS and Android, just need to finish checking on the web) and squash all the commits into one so I can open a PR. I'm currently waiting on a medical appointment, so I'll do that once that's sorted.