ebd6f4bc8f
Use ShellGenericContainer to implement a fully dynamic layout for the application well. It's still fixed to 4 columns by default, but no longer requires a fixed width to be passed in on start. With another chunk of work, it could likely try to adjust to the case where we can only fit fewer than 4 items in the well. Remove the border highlighting on mouseover, since that caused reallocations, and the grid layout isn't trivial. Delete the unused shell_global_get_word_with function.
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