* Use `curly_braces_in_flow_control_structures` for `material`

* include test/material

* add back removed comments

Co-authored-by: Bruno Leroux <bruno.leroux@gmail.com>

`Tooltip`: Add an example for `TooltipTriggerMode.manual` and add tests for existing `Tooltip` examples (#100554)

This reverts commit 6b94f2f6.

This reverts commit 5fd259be.

This does a cleanup of the examples, removing all of the "section" markers and extra comments that we don't need anymore now that the samples are no longer in the source code. It also removes the --template arguments from the {@tool dartpad} and {@tool sample} directives, since those are no longer used. It converts two examples that I discovered were still embedded into linked examples in the examples folder.

I didn't delete the templates from the snippets config folder yet, because there are still embedded samples in the dart:ui package from the engine that use them. Once dart:ui no longer uses the templates, they can be removed.

I bumped the version of the snippets package to pick up a change that allows removal of the --template argument.

This reverts commit ab51a026 and fixes the test that broke the first time it landed.

This reverts commit 885b2f56 to green up the build.

Submitting on red to fix the build.

In the process of fixing #90044, I realized that it's also possible for hovered tooltips to show more than one at a time if the widgets are nested, so this PR is a fix that prevents more than one tooltip from showing at a time with hovered tooltips.

This extracts the sample code out from the API doc comments, and places them in separate files on disk, allowing running of the examples locally, testing them, and building of slightly larger examples.

This reverts commit d056500b.

This reverts commit 31de052e.

This reverts commit e2490f29.