Menu: Fix that Buttons not worked as a activator content

[mckaragoz]

Description

fixes #1583, fixes #3063.

Before this, when we click a button which as a activation, the popover didn't open, so menu didn't work.

With an investigate, i think the problem is, menu's activator content has onmouseup, but button's doesn't have, they instead of have onclick. So we may do two optional approach (both works):

1. Change all button's onclick events to the onmouseup events.
2. Change menu's onmouseup event to the onclick event.
   (We cant simply add another onmouseup event because this time when we click a button, onclick and onmouseup both fires twice)

I think the first approach is more problematic because i am sure it's a breaking change.

So i go ahead of the second option. When we change onmouseup to onclick, right click event didn't work (probably thats why we used onmouseup in menu), so i added the oncontextmenu events to succeded a working right click.

With this change, i expected that all contents, all variants and all click types will work with menu properly after this PR.

Note: Added docs that shows that working button as activator content.

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[mckaragoz]

@henon could you check this? I think with different aspects and it works with both BSS and WASM. Do you think there is another unexpected situation?

@Garderoben you commented on #1583 about a solution. But i think popover PR can't solve the #1583 alone, we also need this PR, am i right? (it's not only the z-index property)

[Garderoben]

@Garderoben you commented on #1583 about a solution. But i think popover PR can't solve the #1583 alone, we also need this PR, am i right? (it's not only the z-index property)

Nah my comment stated that if the Buttons where set to Disabled="true" the activator content worked.
Popover PR will not solve this correct.

[henon]

sure looks good. Is this sufficiently covered by the test suite?

[mckaragoz]

I will look at it, actually we should prepare a new test that check all possible situations

[mckaragoz]

@henon test added. Now it completely check all variants (button, iconbutton and activator content-renderfragment) left and right click. Now we have a crucial menu test.

But i don't know about codacy, it says remove the redundant characters.

[henon]

Thanks! Good job.

[ScarletKuro]

I'm late, but looks like this configuration doesn't work when the ActivationEvent is LeftClick: https://try.mudblazor.com/snippet/GaQnkCusULmyTWfg