Add clear recently used crs button

[YoannQDQ]

Fixes #21473

Description

• Adds a column in the recent crs table with a button to clear individual CRS
• Adds a context menu (right click) with two actions:
  • Clear selected (Same as button)
  • Clear all recent CRS (prompt user for confirmation)
• Pressing the Del key while the list of recently used crs has focus remove the selected CRS

[nicogodet]

May be you could re-use "clear" icon from elevation widget ?

[uclaros]

I'd be more in favor of some way to remove items one by one than a clear button (right click -> remove?).
Most users commonly use a set of CRSs and, as mentioned in the request ticket, they sometimes get an extra CRS polluting their list. While the clear button will remove the unwanted CRS, the user will still have to rebuild his commonly used set.

[YoannQDQ]

Ok, I added a way to remove CRS individually.
Now I was wondering:

• Should I keep the "Clear all recent crs" option?
• Would a context menu be better than the small button in the last column?

Any thoughts @uclaros?

[alexandreparente]

Maybe you can just use the right click.

[YoannQDQ]

What I find annoying with the context-menu-only solution, is that it can easily never be found by the user. If we move forward with this, there's nothing to indicate that the CRS list now has a context menu...

[uclaros]

What I find annoying with the context-menu-only solution, is that it can easily never be found by the user. If we move forward with this, there's nothing to indicate that the CRS list now has a context menu...

That's a valid point. However, I'm afraid the clear buttons (especially the clear all) might be too easy to click, removing more than needed. Also, the clear buttons, while really pleasing visually, are kind of unusual in qgis (usually lists have + and - buttons next to the list, not inside the rows)
This is just my personal preference though.

On a side note, Remove selected instead of clear selected would probably be more appropriate wording.

[m-kuhn]

Nice functionality. I would prefer to remove the "clear all" button on top of the list and only leave it in the context menu. This will keep the user interface a bit cleaner.

[YoannQDQ]

Done

[github-actions]

@YoannQDQ
This pull request has been tagged as requiring documentation.

A documentation ticket will be opened at https://github.com/qgis/QGIS-Documentation when this PR is merged.

Please update the description (not the comments) with helpful description and screenshot to help the work from documentors.
Also, any commit having [needs-doc] or [Needs Documentation] in will see its message pushed to the issue, so please be as verbose as you can.

Thank you!

[YoannQDQ]

@m-kuhn Could you merge this now? Thanks :)

[m-kuhn]

With pleasure

[github-actions]

@YoannQDQ
A documentation ticket has been opened at qgis/QGIS-Documentation#8216
It is your responsibility to visit this ticket and add as much detail as possible for the documentation team to correctly document this change.
Thank you!