problem with menus that are too long

[guiodic]

I am not able to describe the problem clearly, so I prefer to send a video. The issue emerges only for long menues (higher than screen hight)

https://user-images.githubusercontent.com/294764/103149908-8f3c4b00-476e-11eb-8176-bafe0a0f366b.mp4

[Zren]

• https://stackoverflow.com/questions/7121718/create-a-scrollbar-in-a-submenu-qt
• https://bugreports.qt.io/browse/QTBUG-5103
• https://doc.qt.io/qt-5/qstyle.html
• https://github.com/qt/qtbase/blob/5.15/src/widgets/widgets/qmenubar.cpp
• https://github.com/qt/qtbase/blob/5.15/src/widgets/widgets/qmenu.cpp

enum QStyle::ContentsType

Constant	Value	Description
QStyle::CT_Menu	10	A menu, like QMenu.
QStyle::CT_MenuBar	9	A menu bar, like QMenuBar.
QStyle::CT_MenuBarItem	8	A menu bar item, like the buttons in a QMenuBar.
QStyle::CT_MenuItem	7	A menu item, like QMenuItem.

enum QStyle::ControlElement

Constant	Value	Description
QStyle::CE_MenuBarItem	20	A menu item in a QMenuBar.
QStyle::CE_MenuBarItem	20	A menu item in a QMenuBar.
QStyle::CE_MenuBarEmptyArea	21	The empty area of a QMenuBar.
QStyle::CE_MenuItem	14	A menu item in a QMenu.
QStyle::CE_MenuScroller	15	Scrolling areas in a QMenu when the style supports scrolling.
QStyle::CE_MenuTearoff	18	A menu item representing the tear off section of a QMenu.
QStyle::CE_MenuEmptyArea	19	The area in a menu without menu items.
QStyle::CE_MenuHMargin	17	The horizontal extra space on the left/right of a menu.
QStyle::CE_MenuVMargin	16	The vertical extra space on the top/bottom of a menu.

• https://github.com/qt/qtbase/blob/9a1f2c2461c7e3e465cd6cb9ac9f8d3e3676c919/src/widgets/styles/qstylesheetstyle.cpp#L5412

// This adds a scroller at the top, but an overflow at the bottom :/
actionMenu->setStyleSheet(QLatin1String("QMenu { menu-scrollable: true; }"));

// We can set the dropdown X11 property after the window opens. I think it's ignored if set before.
// It does nothing visually however.
actionMenu->popup(rootPosition);
actionMenu->setAttribute(Qt::WA_X11NetWmWindowTypeDropDownMenu);

[Zren]

So the issue is probably because the menu bar isn't a real QMenuBar so it's drawing the menus above the original position.

Edit: What's your screen resolution?

Hmm, is there an environment variable to scale GTK applications so I can easily test in 1080p?

[guiodic]

Edit: What's your screen resolution?

1366x768

Hmm, is there an environment variable to scale GTK applications so I can easily test in 1080p?

I don't know, but Libreoffice is a QT app. I have the same problem with Inkscape that is GTK.

[Zren]

Wait nvm, I need to scale KWin not the app itself. I can use the Qt scaling env vars when restarting kwin to test it hopefully... Or just double the UI scaling... Was hoping to not scale my entire OS though.

[gobonja]

This can also be reproduced by making kate height smaller than submenu height, than after opening submenu (e.g. File) move mouse to next menu item that is below opened submenu (e.g. Edit) Here is video:

https://user-images.githubusercontent.com/26535797/103156694-a5b4c780-47ab-11eb-97ef-77d58e8444b5.mp4

[guiodic]

Yes, it's the same problem

(what's your screen recorder?)

[gobonja]

(what's your screen recorder?)

OBS Studio

[Zren]

Oh ya, it's easy to just move the window to the bottom of the screen. It looks like the menu will open up the 2nd top level menu if you hover where "Edit" is even though the "File" submenu is covering it.