- if an unloaded tab is being opened, do not close the
tab and have reader re-open a fresh tab. Instead, keep the
tab as is, have reader use the tab as a container and
just change the tab's type. It should fix a glitch on
windows when if you click on a tab during initial loading,
it will disappear until reader re-adds it. A few tweaks
to allow unloaded tabs be generally "selectable".
Fixes: #4149
- during startup loading, select the yet-unloaded tab right
away. That way, a tab is almost immediately selected,
instead of being stuck on the library tab until the reader is ready.
- if the items are not loaded yet, use a placeholder
icon for tabs. Fixes: #4150
- special handling for reader loading message during initial
load. When an unloaded tab is selected, the loading message
needs to be displayed but, since there is no reader yet, we
add it in Zotero_Tabs.select and try to remove by the reader
when it's loaded.
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