Decouple "Active Terminal" and "Focused Control" #3540
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If I want to double up and also fix #522 (which I do), then I need to also * when a tab GetsFocus, send the focus instead to the Pane * When the border is clicked on, focus that pane's control And like a lot of cleanup, because this is horrifying
If the border is `Transparent`, then it can't hittest for Tapped events, and it'll fall through (to someone) THis at least works, but looks garish
zadjii-msft
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carlos-zamora
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Nov 12, 2019
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Summary of the Pull Request
Unties the concept of "focused control" from "active control".
Previously, we were exclusively using the "Focused" state of
TermControls to determine which one was active. This was fraught with gotchas - if anything else became focused, then suddenly there was no pane focused in the Tab. This happened especially frequently if the user clicked on a tab to focus the window. Furthermore, in experimental branches with more UI added to the Terminal (such as dev/migrie/f/2046-command-palette), when these UIs were added to the Terminal, they'd take focus, which again meant that there was no focused pane.This fixes these issue by having each Tab manually track which Pane is active in that tab. The Tab is now the arbiter of who in the tree is "active". Panes still track this state, for them to be able to MoveFocus appropriately.
It also contains a related fix to prevent the tab separator from stealing focus from the TermControl. This required us to set the color of the un-focused Pane border to some color other that Transparent, so I went with the TabViewBackground. Panes now look like the following:
References
See also: #2046
PR Checklist
Validation Steps Performed
Tested manually opening panes, closing panes, clicking around panes, the whole dance.