1725088 - Work out what tree-listbox should do when there are 0 rows

Status: RESOLVED FIXED

(Thunderbird :: General, enhancement)

Description

[Geoff Lankow (:darktrojan)]

The listbox was conceived for a use case where there are always rows. Now we want to use it for uses where there might be zero rows.

Comment 1

[Geoff Lankow (:darktrojan)]

Attachment: Bug 1725088 - Define the behaviour of tree-listbox when there are 0 rows. r=mkmelin

If there are zero rows to begin with, or all rows are removed, selectedIndex becomes -1. If a row is then added, it becomes selected automatically.
This patch also handles what happens if the selected row is removed. Selection moves to

• the nearest remaining ancestor, or if there isn't one
• the top-level row preceding the removed rows, or if there isn't one
• the first top-level row.

Comment 2

[Geoff Lankow (:darktrojan)]

Attachment: Bug 1725088 - Move tree-listbox event listeners and observers out of connectedCallback. r=mkmelin

Depends on D122329

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/comm-central/rev/487fc069e82d
Define the behaviour of tree-listbox when there are 0 rows. r=mkmelin
https://hg.mozilla.org/comm-central/rev/df08e87957ed
Move tree-listbox event listeners and observers out of connectedCallback. r=mkmelin