[stable13] Fix scrolling in chat view#843
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When an element has a negative top margin jQuery returns its top position as the position in where the element would be if it had no margin. In a similar way, when there is a negative margin the returned height is not the actual height of the element, but its height without that margin. The message list is expected to scroll to the newest message if the last one is partially visible, but due to the jQuery behaviour the message list did not scroll when the last message was grouped and less than 20px (the negative top margin) of the content of that message was visible. Now the negative margin is taken into account and the message list always scrolls to the newest message if the last one is partially visible. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
The scroll area covers the top and bottom padding of an element, but not its top and bottom margins, so the margins should not be taken into account in the scroll calculations. Currently this does not cause any difference in the behaviour, as the message lists does not have any margin, but it is fixed just in case it is added in the future. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
When an element is detached and then attached again its scroll position is reset to the top. Now the chat view provides the "saveScrollPosition" and "restoreScrollPosition" methods to save the scroll position before detaching its element and then restoring it when attached again. Note that the position can not be exactly restored, as the size of the chat view may have changed due to switching it from the main view to the sidebar, and thus the visible messages can not be the same in both cases. Due to this, restoring the scroll position just ensures that the last message that was partially visible when it was saved will be fully visible when it is restored. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
nickvergessen
approved these changes
May 2, 2018
Ivansss
approved these changes
May 2, 2018
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Backport of #838