Re: 1.13 Public Test Realm online!
Even for singleplayer, enabling higher resolutions would probably require a lot of work. You might have noticed yourself that the AI only works within the usual 800x600 (+ a bit) and monsters farther away just stand around (while you can already attack them, e.g. with LS), i.e. just upping the resolution results in a broken game. This might be not so apparent at smaller resolutions, but in the cow level at 1920x1200 it's pretty obvious.
Basically every resolution would need a specialized AI. Enabling just 1024x768 would most likely already require more effort than Blizzard is willing to put in.
D2 at 1920x1200 looks incredibly great though, especially for a 10 year old game. I'd recommend trying it to anyone with a large enough screen (just for looking around, not for playing - back up your save files before etc).
As for the window mode related stuff, its all pretty moot for me. I don't just want a larger window size, I want a larger resolution. I eventually stopped playing Diablo II back in the day because I couldn't stand the claustrophobic resolution (even 800x600 is awful). When I discovered a mod I assume I can't mention here, new life was breathed back into the game. Suddenly, Diablo was fun again.
I am very disappointed (not surprised, just disappointed, because they should have done it long ago) that Blizzard didn't code something along those lines in as part of the official game. Heck, restrict it to solo play if unfair advantages is a concern. As it is, I can't start using 1.13 (and need to roll my install back to 1.12 now) until that mod is compatible with it. Playing 800x600 to test the patch was downright painful.
Even for singleplayer, enabling higher resolutions would probably require a lot of work. You might have noticed yourself that the AI only works within the usual 800x600 (+ a bit) and monsters farther away just stand around (while you can already attack them, e.g. with LS), i.e. just upping the resolution results in a broken game. This might be not so apparent at smaller resolutions, but in the cow level at 1920x1200 it's pretty obvious.
Basically every resolution would need a specialized AI. Enabling just 1024x768 would most likely already require more effort than Blizzard is willing to put in.
D2 at 1920x1200 looks incredibly great though, especially for a 10 year old game. I'd recommend trying it to anyone with a large enough screen (just for looking around, not for playing - back up your save files before etc).