Make `cycle-spacing' behave more like `just-one-space' if colled once.
* simple.el (cycle-spacing): Never delete spaces on first run by default, but do so in a new 'fast mode and if there are already N spaces (the previous behaviour). Compare N with its value in previous invocation so that changing prefix argument restarts `cycle-spacing' sequence. The idea is that with this change, binding M-SPC to `cycle-spacing' should not introduce any changes in behaviour of the binding so long as users do not type M-SPC twice in a raw with the same prefix argument or lack thereof.
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