# Idea: remembering where the divide between thread list and message window is I suggest making the split a percentage. Even a very approximate one. "User has thread list as 25% of the window, message pane as 75%." A low granularity would be enough. 10 steps, say. 4 steps would be enough for me: 1/4 threads, 3/4 message; 50:50; or 3/4 threads, 1/4 message. Then it would follow as the window resized. # Reasoning One of my displays is portrait mode. I regularly switch between having Thunderbird full screen (10:16 aspect ratio) and tiled to half the screen. Whenever I resize it down (to less than full screen) the thread pane shrinks to just big enough to show the current message and nothing else. The app does does store where the split is as a percentage or anything, it tries to store the size in pixels or something. When the window is suddenly smaller, it shrinks the thread view as small as it can, so the thread list disappears. I then have to "feel around" with the mouse for the invisible line that is the drag handle. (I think it's the line between the last shown thread and the headers but it's not indicated or highlighted in any way.) Then I can resize it so I can see the list of threads.
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