qsm-odoo
40ca30a12e
The website edition system is based on a main mutex to guarantee the
order of user manipulations. Meaning that if an user follows any flow
really quickly, each part of the flow should be guaranteed to be done
in the order the user asked for, independently from the duration of each
part. The mutex system to ensure that is not robust yet though, or at
least it is not easy to use and should probably be replaced by something
more easier to use in the future. Indeed, some operations are badly
implemented around this mutex.
This is the case of the drag and drop of a snippet into the page. Drag
and dropping a snippet is a long series of operations, to name a few:
1. The user mousedown on a snippet thumbnail
2. The user drags the snippet around
3. The user drops the snippet in a dropzone
4. We scroll the page to the position of the snippet
5. The snippet is built (options' `onBuilt` methods)
6. The snippet public widgets are started
That whole series of operation has to be reduced to an atomic work to
be added to the mutex queue. Meaning that for example, if the user
manages to click on the save button while he is dragging a snippet
around... the editor should only save the page after the whole series
of operations of the drag and drop has completed. This is not the case
right now: the mutex lock is released between (4) and (5) because we
have too: (5) and (6) use the mutex themselves and would thus induce
a deadlock if we only release the mutex after (6) as it should be. This
means that during the scroll to the snippet (4), if the user manages to
click on the save button, the save operation will be scheduled to be
done before (5) and (6). It is thus technically possible to save a
snippet which is not built** (even if it would not be critical most of
the time). Worse, before building a snippet, its options have to be
instantiated... and that operation is not mutex protected so this is
probably (not 100% sure) possible that this happens:
a. Drag and drop a snippet. During the scrolling, click on save.
b. End of scrolling, the mutex lock is released, we create the first
option and its widgets as part of the onBuilt process. Creating each
widget is async, once the first one is created, the saving process
starts as it was scheduled in (a).
c. Saving the content, destroying all snippet options and their widgets.
d. Continuing building snippet options widgets started at (b)... but
previously-made ones were destroyed at (c)... possible crashes***.
Fixing all of this probably requires a change in the system, maybe the
use of multiple mutexes, maybe the saving operation can always be
delayed at the end of the queue somehow, ... but this requires some more
thinking and probably not possible in stable. In stable, it could be
enough to disable the saving entirely during drag and drop (like drag
and drop of another snippet is currently disabled during another drag
and drop). This will be done in another commit if this is decided.
Meanwhile, this commit just changes the behavior in tours for now:
waiting for drag&drop to fully complete before clicking on save, like
an human would.
** It is possible to reproduce by using the ALT + S shortcut: start
dragging a snippet which has a onBuilt method in its options, hover
the dropzone where you will drop, ALT + S to save (the editor waits
you drop your snippet), drop your snippet -> the snippet is saved and
the edit mode is left... but the onBuilt was not executed.
*** a crash was indeed found during a specific theme tour (out of ~30
Odoo themes because of this after the other commit of this current
PR). After those other commits especially, it is also possible to
reproduce with the ALT + S trick, although not consistently. It may
be linked to the specific last snippet added by that theme tour
instantiating specific options. But as explained saving just after
drop is an issue independently from this potential crash problem
(snippet not built, etc).
X-original-commit: e96167ae20d2a143d7def4347166b37e158003b0
Part-of: odoo/odoo#102800
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