[Megathread] Panes Titlebar Follow-ups

[zadjii-msft]

[Panes megathread #1000] [Original PR: #7371] [Original Issue: #4717]

Tasks

• Add a context menu entry for "close pane"
• Add a context menu entry for "zoom pane"
• Add optional "maximize/close" control
  • Like the MinMaxCloseControl, but without minimize, and with "maximize" being "zoom pane"
  • Should that option be in the theme? (Add comprehensive XAML "theming" functionality #3327) I'm thinking YES
• Allow moving panes to other tabs Allow moving panes to other tabs #7075

Open Discussion

• How should pane title color work with tabColor? Add titlebars to panes #7371 (comment)

Currently, setting the tab's background color with the color picker does not update the pane titlebar color.

I think that's fine. Currently, the order of precedence is [tab runtime color, control title color, theme color (unimplemented), default color]. So I could imagine this going two ways:

• convert the "tab runtime color" to be a "pane runtime color". Then, using the color picker on the tab would set the active pane's runtime color. This comes with the detrimental side effect that you'd have to re-color each pane in a tab manually.
• add an additional "pane runtime color", and have the tab's color be composed from [tab runtime color, pane color (which is itself [pane runtime color, control title color, theme pane title color]), theme color, default]. This would allow panes to have their color changed at runtime with a color picker, and also have the tab have a manual color override.

I'm of course just hypothesizing here in the comments - I don't think any of this is something that needs to get done in this PR. We can always loop back on the issue in a follow-up.

• Should the titlebar for a pane not appear until there are multiple panes? Kinda seems like there are three states: paneTitlebarVisibility: [never, multiplePanes, always]