Minimum window dimensions can interfere with cycling through QuickTile presets

[ssokolow]

When a Window like Firefox refuses to shrink beyond a certain size, it can block QuickTile from progressing to the next preset size in the sequence. (For example, Firefox refusing to narrow to one third of the screen width)

This will probably have to be fixed alongside issue #10 since it will require QuickTile to keep state on each window being tiled rather than just inferring from the window's current size.

[ssokolow]

For anyone subscribed to this issue, it's finally fixed, but there's still work to do because QuickTile doesn't currently compensate for windows refusing the dimensions given and it now doesn't get "user dragged window to a new position" detection for free.

That will be my next goal and you can follow issue #87 for the "windows refusing given dimensions" issue. (The other one doesn't yet have an issue thread because I'm using issues #24 and #30 as surrogate TODO reminders and I expect to have them fixed soon.)