Fixes https://github.com/vector-im/riot-web/issues/9353
The ContextualMenu now accepts a zIndex parameter which can be used to control its level. Dialogs are at around 4000 in the z-index, and the context menu defaults to 5000 for the things that need tooltips and such in a dialog.
Fixes https://github.com/vector-im/riot-web/issues/9354https://github.com/matrix-org/matrix-react-sdk/pull/2801 introduced a change which tried to make sure that when the widget URL was changed that the picker would be re-mounted, however it accidentally introduced a regression. While it effectively did the task it wanted to, it failed to keep the previously-mounted sticker picker alive. This is because the Stickerpicker component is remounted when opened, and the _updateWidget function is called. This results in this.state not having the "current" widget, meaning a URL change is always detected when the component is remounted (room changes, open sticker picker).
Instead of remounting always, we'll instead track which sticker picker widget is being used out of band. This therefore means that whenever the Stickerpicker component is mounted it doesn't create a whole new widget, and the existing (background) picker can be used. This also fixes the loading screen that people would see when opening the sticker picker after switching rooms, something which the persistent widget stuff is supposed to solve.
Also fairly significant refactor of the uploading code: there are
a number of different ways of triggerring a file upload and each
went through a different code path (the media config size limit
worked on one of those paths). Basically take a lot of code out
of the views and put it into ContentMessages.
Sorry about the size of this patch.
https://github.com/vector-im/riot-web/issues/7565
Fixes https://github.com/vector-im/riot-web/issues/8714
Fixes https://github.com/vector-im/riot-web/issues/8890
Fixes https://github.com/vector-im/riot-web/issues/9034
Fixes https://github.com/vector-im/riot-web/issues/8954
This turned out to be much more complicated than it needed to be. We use an IndicatorScrollbar to do all the math for us and some minor changes have been made so it can flag left/right overflow. The complicated part is the css changes which make the gradients work: unlike the RoomSubList, we have to calculate the offset of the indicators (gradients) on our own because position:sticky doesn't work horizontally.
The changes to the css (well, mostly pointer-events:none) make it so the gradient doesn't interfere with the room avatars.
9034 and 8954 are fixed by this because they represent an overflow-x:none style breakage where browsers won't let you scroll without a scrollbar. The gradient offset problem is also demonstrated in 8954.
instead of setting a min-height on the whole timeline,
track how much height we need to add to prevent shrinking
and set paddingBottom on the container element of the timeline.
