This file is indexed.

/usr/share/X11/xkb/compat/mousekeys is in xkb-data 2.12-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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// Interpretations for arrow keys and a bunch of
// other common keysyms which make it possible to
// bind "mouse" keys using xmodmap and activate or
// deactivate them from the keyboard.

default partial xkb_compatibility "mousekeys" {

    // Keypad actions.

    interpret.repeat= True;

    interpret KP_1 {
	action = MovePtr(x=-1,y= +1);
    };
    interpret KP_End {
	action = MovePtr(x=-1,y= +1);
    };

    interpret KP_2 {
	action = MovePtr(x=+0,y= +1);
    };
    interpret KP_Down {
	action = MovePtr(x=+0,y= +1);
    };

    interpret KP_3 {
	action = MovePtr(x=+1,y=+1);
    };
    interpret KP_Next {
	action = MovePtr(x=+1,y=+1);
    };

    interpret KP_4 {
	action = MovePtr(x=-1,y=+0);
    };
    interpret KP_Left {
	action = MovePtr(x=-1,y=+0);
    };

    interpret KP_6 {
	action = MovePtr(x=+1,y=+0);
    };
    interpret KP_Right {
	action = MovePtr(x=+1,y=+0);
    };

    interpret KP_7 {
	action = MovePtr(x=-1,y=-1);
    };
    interpret KP_Home {
	action = MovePtr(x=-1,y=-1);
    };

    interpret KP_8 {
	action = MovePtr(x=+0,y=-1);
    };
    interpret KP_Up {
	action = MovePtr(x=+0,y=-1);
    };

    interpret KP_9 {
	action = MovePtr(x=+1,y=-1);
    };
    interpret KP_Prior {
	action = MovePtr(x=+1,y=-1);
    };

    interpret KP_5 {
	action = PointerButton(button=default);
    };
    interpret KP_Begin {
	action = PointerButton(button=default);
    };

    interpret KP_F2 {
	action = SetPtrDflt(affect=defaultButton,button=1);
    };
    interpret KP_Divide {
	action = SetPtrDflt(affect=defaultButton,button=1);
    };

    interpret KP_F3 {
	action = SetPtrDflt(affect=defaultButton,button=2);
    };
    interpret KP_Multiply {
	action = SetPtrDflt(affect=defaultButton,button=2);
    };

    interpret KP_F4 {
	action = SetPtrDflt(affect=defaultButton,button=3);
    };
    interpret KP_Subtract {
	action = SetPtrDflt(affect=defaultButton,button=3);
    };

    interpret KP_Separator {
	action = PointerButton(button=default,count=2);
    };
    interpret KP_Add {
	action = PointerButton(button=default,count=2);
    };

    interpret KP_0 {
	action = LockPointerButton(button=default,affect=lock);
    };
    interpret KP_Insert {
	action = LockPointerButton(button=default,affect=lock);
    };

    interpret KP_Decimal {
	action = LockPointerButton(button=default,affect=unlock);
    };
    interpret KP_Delete {
	action = LockPointerButton(button=default,affect=unlock);
    };

    // Additional mappings for Solaris keypad compatibility.

    interpret F25 { // aka KP_Divide
	action = SetPtrDflt(affect=defaultButton,button=1);
    };
    interpret F26 { // aka KP_Multiply
	action = SetPtrDflt(affect=defaultButton,button=2);
    };
    interpret F27 { // aka KP_Home
	action = MovePtr(x=-1,y=-1);
    };
    interpret F29 { // aka KP_Prior
	action = MovePtr(x=+1,y=-1);
    };
    interpret F31 { // aka KP_Begin
	action = PointerButton(button=default);
    };
    interpret F33 { // aka KP_End
	action = MovePtr(x=-1,y= +1);
    };
    interpret F35 { // aka KP_Next
	action = MovePtr(x=+1,y=+1);
    };

    interpret.repeat= False;

    // New keysym actions.

    interpret Pointer_Button_Dflt {
	action= PointerButton(button=default);
    };
    interpret Pointer_Button1 {
	action= PointerButton(button=1);
    };
    interpret Pointer_Button2 {
	action= PointerButton(button=2);
    };
    interpret Pointer_Button3 {
	action= PointerButton(button=3);
    };
    interpret Pointer_DblClick_Dflt {
	action= PointerButton(button=default,count=2);
    };
    interpret Pointer_DblClick1 {
	action= PointerButton(button=1,count=2);
    };
    interpret Pointer_DblClick2 {
	action= PointerButton(button=2,count=2);
    };
    interpret Pointer_DblClick3 {
	action= PointerButton(button=3,count=2);
    };
    interpret Pointer_Drag_Dflt {
	action= LockPointerButton(button=default);
    };
    interpret Pointer_Drag1 {
	action= LockPointerButton(button=1);
    };
    interpret Pointer_Drag2 {
	action= LockPointerButton(button=2);
    };
    interpret Pointer_Drag3 {
	action= LockPointerButton(button=3);
    };

    interpret Pointer_EnableKeys {
	action= LockControls(controls=MouseKeys);
    };
    interpret Pointer_Accelerate {
	action= LockControls(controls=MouseKeysAccel);
    };
    interpret Pointer_DfltBtnNext {
	action= SetPtrDflt(affect=defaultButton,button= +1);
    };
    interpret Pointer_DfltBtnPrev {
	action= SetPtrDflt(affect=defaultButton,button= -1);
    };

    // Allow an indicator for MouseKeys.
    indicator "Mouse Keys" {
        //!allowExplicit;
	indicatorDrivesKeyboard;
	controls= MouseKeys;
    };
};