It's been a while, so I might be recalling this incorrectly, but didn't we pick a size that should work in both landscape and portrait mode?

(multi-window split is another deal).

We use 30% of the screen height, which tends to work in both landscape and portrait, but it's odd that closing and re-opening the dialog makes it change size. 30% does break when you go from portrait to a small multi-window split.

 Issue 629066  has been merged into this issue.

From 629066, the width is also not updating on rotations, which is surprising because that's explicitly set to MATCH_PARENT in https://cs.chromium.org/chromium/src/chrome/android/java/src/org/chromium/chrome/browser/ItemChooserDialog.java?l=394-401.

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