Clicking on a block does not select it

[AlexandreSajus]

If you click on a block, it is highlighted in yellow indicating that it is selected.

Yet when pressing Ctrl+C, it won't copy it.

If you select it by dragging the mouse over it (placing it in a selection rectangle) copying works

Same thing for pressing "Space" when selecting a block

[MathisFederico]

After verification, the issue is still occurring on dev after the merge.

To reproduce:

Create a new scene:

Create a new codeblock:

Simply click on the block:

Press Ctrl+C to try to copy and then Ctrl+V, paste won't work.

Even worst:
Press Ctrl+X adn it will crash the application.

[FabienRoger]

The Ctrl-X bug can be patched quickly by checking if there is data to delete, but the other one is much more complex than I thought. There are huge collision between Qt copying system and ours. Even before all these changes, PyQt didn't activate the "copy" function when a block was selected (not even before we check that we are not in editing mode). The Keypressed event isn't activated either, even when disabling the copy function and its trigger. Most other shortcut work (replacing "Ctrl+C" by "c" or "Ctrl+K" solves the bug. So it's very weird.

But am I starting to see a way to patch this: "keypress" event isn't called, but "event" is! And it contains the relevant information to detect a "ctrl+c", so by checking manually what is happening, this issue is solvable.