salvage: remove invalid isDmaBuf override (credit @Ryanf55 #14365)

[Bartok9]

Summary

• Remove non-overriding isDmaBuf() const override from GstDmaBufVideoBuffer after HumBuffers path move under dmabuf/.

Salvage

Rebased usefulness of @Ryanf55 #\14365 onto current master. Original path moved; the base GstHwVideoBuffer / QHwVideoBuffer still do not declare isDmaBuf(), so override remains incorrect and trips earlier GCC paths.

Motivation

Keep DMABuf GPU path header compilable against Qt multimedia private API without a phantom override.

Verification

• isDmaBuf gone from dmabuf header; base still has no virtual
• No runtime video pipeline behavior change intended (unused incorrect override)

Credit

Original idea and diff intent: @Ryanf55 in #14365. This salvage re-targets the moved path only.

Notes

AI-assisted path rewrite; human-reviewed. Not bite-size-gated salvage (Daniel 2026-07-15).

[github-actions]

Build Results

Platform Status

Platform	Status	Details
Linux	Passed	View
Windows	Passed	View
MacOS	Passed	View
Android	Passed	View

All builds passed.

Pre-commit

Check	Status	Details
pre-commit	Failed (non-blocking)	View

Pre-commit hooks: 0 passed, 0 failed, 0 skipped.

Test Results

linux-coverage-integration: 33 passed, 0 skipped
linux-coverage-unit: 107 passed, 0 skipped
Total: 140 passed, 0 skipped

Code Coverage

Coverage	Baseline	Change
67.7%	67.7%	+0.0%

Artifact Sizes

Artifact	Size	Δ from master
QGroundControl	221.84 MB	-4.46 MB (decrease)
QGroundControl-aarch64	179.44 MB	+0.00 MB (increase)
QGroundControl-installer-AMD64	137.94 MB	-0.44 MB (decrease)
QGroundControl-installer-AMD64-ARM64	80.45 MB	-0.20 MB (decrease)
QGroundControl-installer-ARM64	109.22 MB	+0.01 MB (increase)
QGroundControl-linux	87.10 MB	-78.80 MB (decrease)
QGroundControl-mac	87.09 MB	No change
QGroundControl-windows	86.16 MB	No change
QGroundControl-x86_64	191.65 MB	+0.00 MB (increase)
Total size decreased by 83.88 MB

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_{Updated: 2026-07-19 01:15:32 UTC • Commit: 8910dad • Triggered by: Android}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.53%. Comparing base (f29efd3) to head (8910dad).
⚠️ Report is 153 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14622      +/-   ##
==========================================
+ Coverage   25.47%   31.53%   +6.06%     
==========================================
  Files         769      785      +16     
  Lines       65912    66977    +1065     
  Branches    30495    31023     +528     
==========================================
+ Hits        16788    21121    +4333     
+ Misses      37285    31546    -5739     
- Partials    11839    14310    +2471     

Flag	Coverage Δ
unittests	31.53% <ø> (+6.06%)	⬆️

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see 455 files with indirect coverage changes

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