On 3/6/20 12:47 PM, Thomas Kluyver wrote:
One thing that might get broken: creating a selection with the keyboard (shift
+ arrow keys) and then middle clicking to paste it somewhere else. When you
select with the keyboard, there's no mouse up event, and no other obvious event
to mean a selection is 'finished'. Maybe this is an unusual pattern, but I bet
there are some people who do it.
Maybe the answer to that is just to say that PRIMARY is updated when either the
mouse button is released, or the selection is changed with the keyboard.
Thomas
Right, I don't want to interfere with text selection. So considering
this and double/triple clicks, we could say
- If text is marked with a mouse, the PRIMARY buffer is updated when
the act of text selection is finished. Specifically, updates only happen
on mouse button releases.
- A text selection is replaced by the contents of the PRIMARY buffer
when a middle click is registered within it.
The first point aligns with wayland's opinion on when the buffer update
should happen. Its primary selection protocol states:
"[...] In order to minimize calls in pointer-driven text selection, it
should happen only once after the operation finished. [...]"
While I wrote this, I realized that waiting for the timeouts to run down
in the context of double/triple clicks, which is required to only do the
update once per selection operation, isn't good. Buffer updates after
double click would get deferred by the timeout. Very quick people would
notice and race conditions may happen.
This is why I wouldn't mention timeouts and live with this not being
possible with triple and more click selections.
It'd be still very useful for middle click users.
The vast majority of clients I tried behave like described in point one
(modulo triple click) already. And since the behaviour is encouraged by
wayland also, the only real new requirement would be the second point.
Johannes
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