"Universal" workspace panning

[yohannd1]

This PR adds the ability to pan through the workspace without having to click on the background, primarily through a new keybinding to start panning (which I am calling "universal panning"), but also through the returnal of scrollbars.

For the panning keybinding, the trigger I have set up at the moment is the key combo Ctrl+Alt+Click Alt+S+Click, which might not be ideal, but it was the most unique modifier combination I could think of.

2026-01-26.panning_scroll_demo.v2.mp4

Progress:

• Initial implementation
• Change keybinding: Ctrl+Alt -> Alt+S
• Fix offset bug (at 0:12 in the video)
• Add checks to prevent dragging in odd situations (at 0:16 in the video)
• Fix bug where panning without the keybinding, finishing and then trying to drag a widget is causing weird issues. Usually it tries to resize the widget.
• Implement scrollbars
• Fix scrollbar twitching (it glitches out sometimes, specially when going to the top/left while the screen is not maximized)
• Put scrollbars in the correct position (vertical on the right, and bottom one with the width of the workspace widget itself)
• Fix maximized windows being messed up (introduced by 8d333a48b)
• Fix scrollbars appearing when a window is maximized
• Fix wheel-scrolling on the scrollbars (it does nothing, but changes the scrollbar value)
• Figure out what key combo would be the best for this (feel free to chime in, this is the main blocker for the PR)

Feedback is very welcome on this PR. When testing, keep an eye out for whether the scroll bars are working properly and whether panning feels natural, or if it's error prone.

[szeli1]

My concern with this PR is that it looks like to me that other "ctrl + alt" mouse shortcuts may not work because of the event filter. I did not test this PR.
Here is some code that may be effected:
AutomationEditor:

}
else if( we->modifiers() & Qt::ControlModifier && we->modifiers() & Qt::AltModifier )
{

ClipView:

bool ClipView::unquantizedModHeld( QMouseEvent * me )
{
	return me->modifiers() & Qt::ControlModifier || me->modifiers() & Qt::AltModifier;
}

PianoRoll:

void PianoRoll::dragNotes(int x, int y, bool alt, bool shift, bool ctrl)

[yohannd1]

Changed the keybinding to Alt+S, which (as discussed on discord) is not perfect. I'm hoping to find a better keybinding in the future but for now I'm leaving this one, which I believe doesn't have any conflicts.

Also a note to self: adding the keybinding handling on the event filter is sadly necessary, as when it is pressed I have to prevent it from being forwarded to other elements. I tried implementing it with key{Press,Release}Event and it was a mess.

[szeli1]

Also a note to self: adding the keybinding handling on the event filter is sadly necessary, as when it is pressed I have to prevent it from being forwarded to other elements. I tried implementing it with key{Press,Release}Event and it was a mess.

If I remember correctly, there are other options like implementing it in MainWindow::KeyPressEvent, or by using QAction with a shortcut in MainWindow, but event filter may be the best option.

[szeli1]

I did not test this PR.

[szeli1]

Suggested change

#include <QDebug> // TODO: remove (along with other qDebug instances here)