Fix#26731
Almost all "tabindex" in code are incorrect.
1. All "input/button" by default are focusable, so no need to use "tabindex=0"
2. All "div/span" by default are not focusable, so no need to use "tabindex=-1"
3. All "dropdown" are focusable by framework, so no need to use "tabindex"
4. Some tabindex values are incorrect (eg: `new_form.tmpl`), so remove them
Co-authored-by: Giteabot <teabot@gitea.io>
Previously, the tooltip for this button was only shown after opening and
closing it once because it was only set after the server response, now
it shows before opening it.
This PR adds a new dropdown to select a commit or a commit range
(shift-click like github) of a Pull Request.
After selection of a commit only the changes of this commit will be shown.
When selecting a range of commits the diff of this range is shown.
This allows to review a PR commit by commit or by viewing only commit ranges.
The "Show changes since your last review" mechanism github uses is implemented, too.
When reviewing a single commit or a commit range the "Viewed" functionality is disabled.
## Screenshots
### The commit dropdown
### Selecting a commit range
### Show changes of a single commit only
### Show changes of a commit range
Fixes https://github.com/go-gitea/gitea/issues/20989
Fixes https://github.com/go-gitea/gitea/issues/19263
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Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
