resizing with one click has varying effects

When I click the double box in the browser window to make the window much smaller with one click, sometimes the resize is off, especially when this action is your first resizing action (while in split screen mode, full page mode works fine).

Reproduce the one-click double-box resize in the browser while in split-screen mode, especially as the first resize action, and compare it with full-page mode. Trace the split-screen window-resizing entry point and determine why the resulting size varies; done means the first click consistently produces the intended smaller window.

Written by the indexing model from the issue text.