Add a "Cancel All Operations" Button

[mrixner]

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As the title says; adds a button to the updates page toolbar to cancel all operations.

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Closes #1474

[marticliment]

As the title says; adds a button to the updates page toolbar to cancel all operations.

Is this button added only to the updates page? I reckon it would make sense to add it on the 4 toolbars... Or perhaps it could be added to the "More" flyout menu, right above the "Quit UniGetUI button":

[mrixner]

As the title says; adds a button to the updates page toolbar to cancel all operations.

Is this button added only to the updates page? I reckon it would make sense to add it on the 4 toolbars... Or perhaps it could be added to the "More" flyout menu, right above the "Quit UniGetUI button":

Yeah, it's only on the update page. Adding it to the menu flyout instead is a good idea but most people who need it will never find it, at least in time to cancel the operations they messed up. Do you think it makes more sense in the flyout or on each page? Or maybe add it to the little queue list thingy at the bottom?

[marticliment]

Do you think it makes more sense in the flyout or on each page? Or maybe add it to the little queue list thingy at the bottom?

Not gonna lie, the entire operations list is lacking some features (resizable operation space, as in 2.x.x, collapse/expand list button, etc.) which I plan to add when I make the operation rewrite (I will change both backend and UI for operations), so perhaps the button can go on a new, deicated menu/toolbar dedicated to operations (pause queue, retry failed, collapse list, etc.)

Perhaps I can just add the button when I do the rewrite.

[mrixner]

Alright, I guess just leave this here until you do that then.

[mrixner]

As this was added in #3070, I'm closing this PR.