fix: press backspace at the start of first line when edgeless text exist

[Flrande]

Close BS-1528

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Latest commit: 723c326

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[github-actions]

size-limit report 📦

Path	Size
@blocksuite/affine	13 B (0%)
@blocksuite/affine/effects	2.06 MB (-0.03% 🔽)
@blocksuite/affine/block-std	154.27 KB (0%)
@blocksuite/affine/block-std/gfx	76.93 KB (0%)
@blocksuite/affine/global	13 B (0%)
@blocksuite/affine/global/utils	13.82 KB (0%)
@blocksuite/affine/global/env	231 B (0%)
@blocksuite/affine/global/exceptions	552 B (0%)
@blocksuite/affine/global/di	1.65 KB (0%)
@blocksuite/affine/global/types	13 B (0%)
@blocksuite/affine/store	77.95 KB (0%)
@blocksuite/affine/inline	31.31 KB (0%)
@blocksuite/affine/inline/consts	51 B (0%)
@blocksuite/affine/inline/types	13 B (0%)
@blocksuite/affine/presets	1.86 MB (+0.02% 🔺)
@blocksuite/affine/blocks	1.94 MB (-0.02% 🔽)
@blocksuite/affine/blocks/schemas	87.25 KB (0%)

[graphite-app]

Merge activity

• Oct 8, 10:57 PM EDT: The merge label 'merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Oct 8, 10:57 PM EDT: Saul-Mirone added this pull request to the Graphite merge queue.
• Oct 8, 11:02 PM EDT: Saul-Mirone merged this pull request with the Graphite merge queue.

[doodlewind]

GitHub warns about using CJK in branch name, which should be best to avoid.