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Fix increaseNestingLevel/decreaseNestingLevel for multi-item list selections #1319

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Fix increaseNestingLevel/decreaseNestingLevel for multi-item list selections #1319

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f7bb85b
Fix increaseNestingLevel/decreaseNestingLevel for multi-item selections
blshkv Jun 13, 2026
0e66912
Address review feedback: offset-0 end guard and correct test assertion
blshkv Jun 13, 2026
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32 changes: 32 additions & 0 deletions src/test/system/list_formatting_test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,38 @@ testGroup("List formatting", { template: "editor_empty" }, () => {
expectDocument("ab\nc\n")
})

test("increasing nesting level applies to all selected items", async () => {
await clickToolbarButton({ attribute: "bullet" })
await typeCharacters("a\nb\nc")
getSelectionManager().setLocationRange([
{ index: 0, offset: 0 },
{ index: 2, offset: 1 },
])
await clickToolbarButton({ action: "increaseNestingLevel" })
assert.blockAttributes([ 0, 2 ], [ "bulletList", "bullet", "bulletList", "bullet" ])
assert.blockAttributes([ 2, 4 ], [ "bulletList", "bullet", "bulletList", "bullet" ])
assert.blockAttributes([ 4, 6 ], [ "bulletList", "bullet", "bulletList", "bullet" ])
expectDocument("a\nb\nc\n")
})

test("decreasing nesting level applies to all selected items", async () => {
await clickToolbarButton({ attribute: "bullet" })
await typeCharacters("a\n")
await clickToolbarButton({ action: "increaseNestingLevel" })
await typeCharacters("b\n")
await clickToolbarButton({ action: "increaseNestingLevel" })
await typeCharacters("c")
getSelectionManager().setLocationRange([
{ index: 1, offset: 0 },
{ index: 2, offset: 1 },
])
await clickToolbarButton({ action: "decreaseNestingLevel" })
assert.blockAttributes([ 0, 2 ], [ "bulletList", "bullet" ])
assert.blockAttributes([ 2, 4 ], [ "bulletList", "bullet" ])
assert.blockAttributes([ 4, 6 ], [ "bulletList", "bullet", "bulletList", "bullet" ])
expectDocument("a\nb\nc\n")
})

test("decreasing list item's level decreases its nested items level too", async () => {
await clickToolbarButton({ attribute: "bullet" })
await typeCharacters("a\n")
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30 changes: 24 additions & 6 deletions src/trix/models/composition.js
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Original file line number Diff line number Diff line change
Expand Up @@ -415,15 +415,33 @@ export default class Composition extends BasicObject {
}

decreaseNestingLevel() {
const block = this.getBlock()
if (!block) return
return this.setDocument(this.document.replaceBlock(block, block.decreaseNestingLevel()))
const locationRange = this.getLocationRange()
if (!locationRange) return
const startIndex = locationRange[0].index
const endIndex = locationRange[1].offset === 0 && locationRange[1].index > startIndex
? locationRange[1].index - 1
: locationRange[1].index
let document = this.document
for (let i = startIndex; i <= endIndex; i++) {
const block = document.getBlockAtIndex(i)
if (block) document = document.replaceBlock(block, block.decreaseNestingLevel())
}
return this.setDocument(document)
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}

increaseNestingLevel() {
const block = this.getBlock()
if (!block) return
return this.setDocument(this.document.replaceBlock(block, block.increaseNestingLevel()))
const locationRange = this.getLocationRange()
if (!locationRange) return
const startIndex = locationRange[0].index
const endIndex = locationRange[1].offset === 0 && locationRange[1].index > startIndex
? locationRange[1].index - 1
: locationRange[1].index
let document = this.document
for (let i = startIndex; i <= endIndex; i++) {
const block = document.getBlockAtIndex(i)
if (block) document = document.replaceBlock(block, block.increaseNestingLevel())
}
return this.setDocument(document)
}

canDecreaseBlockAttributeLevel() {
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