Update IGraphicsMac_view.mm - getMouseLeft

[janhase88]

Hi guys,
This PR addresses this issue

Problem

The getMouseLeft function in IGraphicsMac_view.mm incorrectly sets the left mouse button state to always true, regardless of its actual state.

Changes

• Updated the getMouseLeft method to use NSEvent for determining the actual state of the left mouse button.

Code Update

- (IMouseInfo) getMouseLeft: (NSEvent*) pEvent {
    IMouseInfo info;
    [self getMouseXY:pEvent : info.x : info.y];
    int mods = (int) [pEvent modifierFlags];

    info.ms = IMouseMod(([pEvent type] == NSEventTypeLeftMouseDown) || ([pEvent type] == NSEventTypeLeftMouseDragged),
                        (mods & NSCommandKeyMask),
                        (mods & NSShiftKeyMask),
                        (mods & NSControlKeyMask),
                        (mods & NSAlternateKeyMask));

    return info;
}

[filipeborato]

I tested this fix and it seems to be correct.