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

![image](https://github.com/go-gitea/gitea/assets/51889757/0db3ae62-1272-436c-be64-4730c5d611e3)

### Selecting a commit range

![image](https://github.com/go-gitea/gitea/assets/51889757/ad81eedb-8437-42b0-8073-2d940c25fe8f)

### Show changes of a single commit only

![image](https://github.com/go-gitea/gitea/assets/51889757/6b1a113b-73ef-4ecc-adf6-bc2340bb8f97)

### Show changes of a commit range

![image](https://github.com/go-gitea/gitea/assets/51889757/6401b358-cd66-4c09-8baa-6cf6177f23a7)


Fixes https://github.com/go-gitea/gitea/issues/20989
Fixes https://github.com/go-gitea/gitea/issues/19263

---------

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>

Should look exactly like before for normal dividers. "Horizontal" ones
look better because they no longer use image backgrounds.

<img width="917" alt="Screenshot 2023-06-27 at 19 07 56"
src="https://github.com/go-gitea/gitea/assets/115237/d97d8dec-6859-44a8-85ba-e4549b4dd9df">

<img width="914" alt="Screenshot 2023-06-27 at 19 05 58"
src="https://github.com/go-gitea/gitea/assets/115237/8bf98544-2d82-4ebf-ac68-d6dc237bd6b2">

<img width="1246" alt="Screenshot 2023-06-27 at 19 00 42"
src="https://github.com/go-gitea/gitea/assets/115237/36a6bb21-6029-4f53-8bee-535f55c66fed">

<img width="344" alt="Screenshot 2023-06-27 at 18 58 15"
src="https://github.com/go-gitea/gitea/assets/115237/a9e70aee-8e6b-4ea1-9e93-19c9f96aec6e">
<img width="823" alt="Screenshot 2023-06-27 at 18 56 22"
src="https://github.com/go-gitea/gitea/assets/115237/e7a497cd-f262-4683-8872-23c3c8cce32f">

<img width="330" alt="Screenshot 2023-06-27 at 19 21 11"
src="https://github.com/go-gitea/gitea/assets/115237/42f24149-a655-4c7e-bd26-8ab52db6446b">

Address
https://github.com/go-gitea/gitea/pull/25163#issuecomment-1599207916

Remove the unused  "icon-button".

And fix the layout:

Without the dropdown icon:

```
	{{svg "gitea-whitespace"}}
```


![image](https://github.com/go-gitea/gitea/assets/2114189/58a524ba-f289-4982-aea2-6f9f9f9cbdcf)


With the dropdown icon:

```
	{{svg "gitea-whitespace" 16 "gt-mr-3"}}
	{{svg "octicon-triangle-down" 14 "dropdown icon"}}
```


![image](https://github.com/go-gitea/gitea/assets/2114189/eb99168b-5d49-40a7-8665-5296cbb4e486)

Co-author: @wxiaoguang 

Close #25096 

The way to fix it in this PR is to change form submit to fetch using
formData, and add flags to avoid post repeatedly.
Should be able to apply to more forms that have the same issue after
this PR.

In the demo below, 'approve' is clicked several times, and then
'comment' is clicked several time after 'request changes' clicked.

After:


https://github.com/go-gitea/gitea/assets/17645053/beabeb1d-fe66-4b76-b048-4f022b4e83a0


Update: screenshots from /devtest

>
![image](https://user-images.githubusercontent.com/2114189/245680011-ee4231e0-a53d-4c2a-a9c2-71ccd98005cc.png)
> 
>
![image](https://user-images.githubusercontent.com/2114189/245680057-9215d348-63d8-406d-8828-17e171163aaa.png)
> 
>
![image](https://user-images.githubusercontent.com/2114189/245680148-89d7b3d1-d7b6-442f-b69e-eadaee112482.png)

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Before:

![image](https://github.com/go-gitea/gitea/assets/18380374/2909352c-b2ab-4d77-b410-9f08c2f5a154)

After:

![image](https://github.com/go-gitea/gitea/assets/18380374/9448fa75-e29b-4f95-a30f-03c73c083a83)

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

The first step of the plan

* #23290

Thanks to @silverwind for the first try in #15394 . Close #10729 and a
lot of related issues.

The EasyMDE is not removed, now it works as a fallback, users can switch
between these two editors.

Editor list:

* Issue / PR comment
* Issue / PR comment edit
* Issue / PR comment quote reply
* PR diff view, inline comment
* PR diff view, inline comment edit
* PR diff view, inline comment quote reply
* Release editor
* Wiki editor

Some editors have attached dropzone

Screenshots:

<details>


![image](https://user-images.githubusercontent.com/2114189/229363558-7e44dcd4-fb6d-48a0-92f8-bd12f57bb0a0.png)


![image](https://user-images.githubusercontent.com/2114189/229363566-781489c8-5306-4347-9714-d71af5d5b0b1.png)


![image](https://user-images.githubusercontent.com/2114189/229363771-1717bf5c-0f2a-4fc2-ba84-4f5b2a343a11.png)


![image](https://user-images.githubusercontent.com/2114189/229363793-ad362d0f-a045-47bd-8f9d-05a9a842bb39.png)

</details>

---------

Co-authored-by: silverwind <me@silverwind.io>

HTML is not XML.

Follow:
* #23574
* Remove all ".tooltip[data-content=...]"

Major changes:

* Remove "tooltip" class, use "[data-tooltip-content=...]" instead of
".tooltip[data-content=...]"
* Remove legacy `data-position`, it's dead code since last Fomantic
Tooltip -> Tippy Tooltip refactoring
* Rename reaction attribute from `data-content` to
`data-reaction-content`
* Add comments for some `data-content`: `{{/* used by the form */}}`
* Remove empty "ui" class
* Use "text color" for SVG icons (a few)

Adding tooltip on "Approve" and "Review Changes" buttons. is try to do
by them self on their PR.
Resolves https://github.com/go-gitea/gitea/issues/23547
`Approve` tootip text :- "Pull request authors can’t approve their own
pull request"
`Request Changes` tooltip text:- "Pull request authors can’t request
changes on their own pull request"


Before 

https://user-images.githubusercontent.com/115237/225984020-306c048f-cb9b-4dee-8929-1c74c331518b.png

After 
<img width="841" alt="image"
src="https://user-images.githubusercontent.com/80308335/226445845-b5f6f6c9-f0dc-4934-a282-3b8be06417a8.png">

Fix visual regression introduced by
https://github.com/go-gitea/gitea/pull/22986.

Before:
<img width="1277" alt="image"
src="https://user-images.githubusercontent.com/115237/222792814-d70c2173-0c7c-4db2-8839-95be63cdc8ee.png">
<img width="649" alt="image"
src="https://user-images.githubusercontent.com/115237/222792989-9b1f5e12-becd-40cc-b02c-e9f59a8e72a4.png">

After: 
<img width="1274" alt="image"
src="https://user-images.githubusercontent.com/115237/222792769-e7a9702f-4b6a-46c4-9385-da103ed4dff0.png">
<img width="565" alt="image"
src="https://user-images.githubusercontent.com/115237/222793084-6de6482b-11dc-4d38-b514-15884d20e140.png">

This PR follows: 
* #22950

### Before

The Review Box has many problems:

* It doesn't work for small screens.
* It has an anonying animation which makes the UI laggy.
* It uses "custom dropdown menu" which is very difficult to fine tune.
* `$().toggle('visible')` is not a correct call 
* jQuery just accepts any invalid `duration` argument:
`$().toggle('anyting')`
* The button is not a button.

<details>

![image](https://user-images.githubusercontent.com/2114189/219948865-6da3f39c-6fde-4c86-9e42-da5020f3d0c3.png)

</details>

### After

These problems are fixed, and eliminate many `!important` games.

<details>

![image](https://user-images.githubusercontent.com/2114189/219952744-8862fe1a-7ef1-49e4-bf92-2d0c1f104ee4.png)

![image](https://user-images.githubusercontent.com/2114189/219952771-be169a76-45fd-47a8-8f9c-b447d064f4ca.png)

![image](https://user-images.githubusercontent.com/2114189/219952784-3f52e9b7-64ce-4ad1-9553-64c33fb83042.png)

</details>

And most dropdown icons still looks good:

<details>

![image](https://user-images.githubusercontent.com/2114189/219952942-52866a00-e0f9-4af7-8fb5-eb1a8cad1ff3.png)

![image](https://user-images.githubusercontent.com/2114189/219948909-b3bfb844-f84e-4b79-ab1f-382ec66dec31.png)

</details>

Co-authored-by: delvh <leon@kske.dev>

As discussed in #22847 the helpers in helpers.less need to have a
separate prefix as they are causing conflicts with fomantic styles

This will allow us to have the `.gt-hidden { display:none !important; }`
style that is needed to for the reverted PR.

Of note in doing this I have noticed that there was already a conflict
with at least one chroma style which this PR now avoids.

I've also added in the `gt-hidden` style that matches the tailwind one
and switched the code that needed it to use that.

Signed-off-by: Andrew Thornton <art27@cantab.net>

---------

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

* Make sure fmt catches all templates

Make's `wildcard` is not recursive so it missed many template files, fix
that by using `find`.

* Update Makefile

The layout on the review code view was broken depending on length of the text. Change all three buttons to icons with tooltip to make more space for these long texts.

Fixes: #20922

* Refactor `i18n` to `locale`

- Currently we're using the `i18n` variable naming for the `locale`
struct. This contains locale's specific information and cannot be used
for general i18n purpose, therefore refactoring it to `locale` makes
more sense.
- Ref: https://github.com/go-gitea/gitea/pull/20096#discussion_r906699200

* Update routers/install/install.go

* First step for multiple dropzones per page.

* Allow attachments on review comments.

* Lint.

* Fixed accidental initialize of the review textarea.

* Initialize SimpleMDE textarea.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Enforce tab indendation in templates

This adds editorconfig-checker [1] to lint the template files so they
conform the editorconfig files. I fixed all current identation issues
using the fix mode of eclint [2] and some manual corrections.

We can extend this linting to other files later, for now I'd like this
PR to focus on HTML template files only.

[1] https://github.com/editorconfig-checker/editorconfig-checker
[2] https://github.com/jedmao/eclint

* fix indendation

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Replace more icons with SVG

- Replace remaining icons on admin page with SVG
- Fix vertical menu background on arc-green
- Minor improvments to frontpage repo search
- More icon replacements here and there

* fix integration

* whitespace tweak

* add comment

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Comment box tweaks and SVG dropdown triangles

- Change all dropdown triangles to SVG
- Bring inline review comment box closer to regular comment boxes
- Enhance arc-green checkbox contrast
- Minor reaction tweaks
- Flexbox the diff file header

* remove a border

* fix type marker in arc-green

* add small code padding

* fix position regression and remove useless rules

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Fix missing styling for dropdown icon on review button

* Remove unnecessary span element

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

* Fix submit review form

Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate lint

Signed-off-by: Andrew Thornton <art27@cantab.net>

* try something different

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Update web_src/less/_base.less

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Fix #5997.

If a push causes the patch/diff of a PR towards target branch to change, all existing reviews for the PR will be set and shown as stale.
New branch protection option to dismiss stale approvals are added.
To show that a review is not based on the latest PR changes, an hourglass is shown

* Make sure author cannot reject/approve their own PR

* Disable buttons in templates too

* Remove unneccessary if check since the switch below catches it

* Fix IsOwner check

* Update template and remove new template variable

* Add alert template and redirect to diff page on review failure

* Redirect to files diff as a little update to #4632

* Initial ui components for pull request review

* Add Review
Add IssueComment types

Signed-off-by: Jonas Franz <info@jonasfranz.software>

(cherry picked from commit 2b4daab)
Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Replace ReviewComment with Content

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add load functions
Add ReviewID to findComments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add create review comment implementation
Add migration for review
Other small changes

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Simplified create and find functions for review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Moved "Pending" to first position

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add GetCurrentReview to simplify fetching current review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Preview for listing comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Move new comment form to its own file

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Implement Review form
Show Review comments on comment stream

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for single comments
Showing buttons in context

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add pending tag to pending review comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add unit tests for Review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fetch all review ids at once
Add unit tests

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Improved comment rendering in "Files" view by adding Comments to DiffLine

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for invalidating comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Switched back to code.gitea.io/git

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Moved review migration from v64 to v65

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Rebuild css

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Improve translations

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix unit tests by updating fixtures and updating outdated test

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Comments will be shown at the right place now

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for deleting CodeComments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix problems caused by files in subdirectories

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for showing code comments of reviews in conversation

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for "Show/Hide outdated"

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update code.gitea.io/git

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for new webhooks

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update comparison

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Resolve conflicts

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Minor UI improvements

* update code.gitea.io/git

* Fix ui bug reported by @lunny causing wrong position of add button
Add functionality to "Cancel" button
Add scale effects to add button
Hide "Cancel" button for existing comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Prepare solving conflicts

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Show add button only if no comments already exist for the line

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add missing vendor files

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Check if reviewer is nil

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Show forms only to users who are logged in

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Revert "Show forms only to users who are logged in"

This reverts commit c083682

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Save patch in comment
Render patch for code comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add link to comment in code

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add reply form to comment list
Show forms only to signed in users

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add 'Reply' as translatable
Add CODE_COMMENT_LINES setting

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix problems introduced by checking for singed in user

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add v70

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update generated stylesheet

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix preview
Beginn with new review comment patch system

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add new algo to generate diff for line range
Remove old algo used for cutting big diffs (it was very buggy)

* Add documentation and example for CutDiffAroundLine

* Fix example of CutDiffAroundLine

* Fix some comment UI rendering bugs

* Add code comment edit mode

* Send notifications / actions to users until review gets published
Fix diff generation bug
Fix wrong hashtag

* Fix vet errors

* Send notifications also for single comments

* Fix some notification bugs, fix link

* Fix: add comment icon is only shown on code lines

* Add lint comment

* Add unit tests for git diff

* Add more error messages

* Regenerated css

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* fmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Regenerated CSS with latest less version

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix test by updating comment type to new ID

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Introducing CodeComments as type for map[string]map[int64][]*Comment
Other minor code improvements

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix data-tab issues

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Remove unnecessary change

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* refactored checkForInvalidation

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Append comments instead of setting

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Use HeadRepo instead of BaseRepo

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update migration

Signed-off-by: Jonas Franz <info@jonasfranz.de>

* Regenerated CSS

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add copyright

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update index.css

Signed-off-by: Jonas Franz <info@jonasfranz.software>