fix: TitleBar height shrinks when window width is reduced

[Copilot]

Two root causes were identified and fixed:

1. TitleBar used loose BoxConstraints (minHeight: content != null ? 48 : 32, maxHeight: 48). With CrossAxisAlignment.stretch and all-flex children, the cross-axis size was clamped to minHeight rather than maxHeight, making the height unpredictable.

2. _RenderTitleSubtitleOverflow reported zero height when elements were hidden. When the title or subtitle was hidden to fit a narrow window width, computeMinIntrinsicHeight and computeMaxIntrinsicHeight skipped hidden children (guarded by !childParentData.isHidden), returning 0. This stale state propagated up the layout tree, causing parent widgets to compute a smaller height for the TitleBar.

Changes

• title_bar.dart — TitleBar.build(): Replace loose BoxConstraints with BoxConstraints.tightFor so the outer height is always deterministic:
  • content != null → 48px
  • content == null → 32px

// Before
BoxConstraints(minHeight: content != null ? 48 : 32, maxHeight: 48)

// After
BoxConstraints.tightFor(height: content != null ? 48 : 32)

• title_bar.dart — _RenderTitleSubtitleOverflow: Remove the isHidden guard from computeMinIntrinsicHeight and computeMaxIntrinsicHeight so height is always computed from all children, regardless of their current visibility — consistent with _performLayout, which already measures all children for height.

• navigation_view_test.dart: Add regression tests verifying TitleBar height is stable at 48px (with content) and 32px (without content) across both wide and narrow window widths.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>🐛 When window is resized to smaller width, TitleBar shrinks in height</issue_title>
<issue_description>### Describe the bug
Upon resizing the window to a smaller size (specifically reducing the window width), the TitleBar shrinks in height, causing the inner Widgets to appear "clipped".

To Reproduce

Is also reproducible on the deployed documentation
Steps to reproduce the behavior:

1. Shrink the web page in width
2. Observe the TitleBar height reduces, and makes content appear "clipped"

Expected behavior

TitleBar height should not change

Screenshots

✅ Window large enough	❌ Small window

Additional context

My app's changes are available here: Codertainment/scrcpy_buddy#86</issue_description>

<agent_instructions>Update the tests and the changelog at the end.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes 🐛 When window is resized to smaller width, TitleBar shrinks in height #1308

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[bdlukaa]

@copilot The issue seems to happen when we hide an element of the title bar, such as the title, to make the title bar fit in the available width.

[Copilot]

@copilot The issue seems to happen when we hide an element of the title bar, such as the title, to make the title bar fit in the available width.

Exactly right — _RenderTitleSubtitleOverflow.computeMinIntrinsicHeight and computeMaxIntrinsicHeight were skipping hidden children (guarded by !childParentData.isHidden). So when the title was hidden to fit the available width, both methods returned 0, causing parent widgets to see a collapsed height for the TitleBar.

Fixed in 9363d4e: removed the isHidden guard from both intrinsic height methods so they always measure all children — matching the existing _performLayout behavior which already correctly computes maxHeight from all children regardless of visibility.

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