This allows fullscreen to be toggled in the editor without having to change to 3d mode first.

engine: invalidate stored window position when changing video mode if the combination of origin position and new window size would place the window outside the bounds of the display

I've never seen them fail, but I guess I wouldn't know

I am frankly amazed that it took years for this to ever become a problem.

engine: slightly improve window position handling to help weird edge cases where the window manager places the window at -1

Also decreases MAXUSERTILES to (MAXTILES - 256) to ensure the tilespace
used by the viewscreens isn't encroached on by user tiles.

There are maps which depend on projectiles getting reflected
by walls with the picnum of MIRROR.

Jordon Moss authored Apr 16, 2022 and Richard Gobeille committed Apr 16, 2022

When loading new art files, blanks no longer erase existing tiles, allowing "inserting" new tiles, or essentially stacking them.

Everything is hooked up to the engine and functional, but nothing in this branch is utilizing this yet.

This is intended to address complaints of GPU coil whine. While these are obviously actually just complaints about the user's own hardware, we don't really need hundreds of frames per second in the menus, do we?

engine: add optional throttle parameter to engineFPSLimit() to limit the framerate to the refresh rate in menus, etc

engine: fix bug where the desktop refresh rate was being ignored in windowed mode, always print refresh rate to console on video mode change

For anyone that really thinks they need more than 1000 fps, "r_maxfps -2" will revert to the previous completely unthrottled behavior.