attempt at smart zoom

[thisiscam]

#5

Code is pretty ad-hoc but seems to work to a good degree.
I will post progress here.

[nizioleque]

Hi, it looks great, but I have a couple notes/suggestions:

• On Windows, this doesn't work at all, because clicking the middle button triggers scroll. You need to always call preventDefault() in your event listener (inside the if).
• I'm not sure what to do with the default behavior of middle click on links (opening a link in new tab). We can either leave it as it is (it will be possible to open links in a new tab, but zooming on them will also trigger them) or we can disable this default behavior. Or we can disable smart zoom if a link is being clicked - this is probably the best option.
• For the two reasons above (disabling other browser features), we definitely shouldn't disable this default behavior for all users, so we should probably add an option in the settings to disable the smart zoom.
• I don't like the fact that on small elements it zooms in very close. We should probably have some maximum scale, or look at the element's size and zoom in on its parent (or the parent's parent, ...) instead if it's too small. I think the second option makes more sense.

Other than that, it's great! Thank you for the contribution. Please let me know if you can fix any of the issues I mentioned. If not, I'll try to do this, but it will probably take me a long time.