Issue 1:
[Enter steps to reproduce below:]

...

...

Atom Version: 0.186.0

System: Mac OS X 10.10.2

Thrown From: Atom Core

Stack Trace

Uncaught Error: No line exists for row 10. Last screen row: 9

At /opt/app/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:385

Error: No line exists for row 10. Last screen row: 9
at TextEditorPresenter.<anonymous> (/opt/app/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:385:19)
at TextEditorPresenter.module.exports.TextEditorPresenter.batch (/opt/app/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:91:12)
at TextEditorPresenter.module.exports.TextEditorPresenter.updateLinesState (/opt/app/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:375:19)
at TextEditorPresenter.module.exports.TextEditorPresenter.getState (/opt/app/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:123:14)
at TextEditorComponent.module.exports.TextEditorComponent.updateSync (/opt/app/Atom.app/Contents/Resources/app/src/text-editor-component.js:172:38)
at /opt/app/Atom.app/Contents/Resources/app/src/text-editor-component.js:280:28
at ViewRegistry.module.exports.ViewRegistry.performDocumentUpdate (/opt/app/Atom.app/Contents/Resources/app/src/view-registry.js:159:9)
at /opt/app/Atom.app/Contents/Resources/app/src/view-registry.js:3:61

Commands

2x -1:54.8 core:move-left (atom-text-editor.editor.is-focused)
-1:53.6 core:move-right (atom-text-editor.editor.is-focused)
-1:53.2 core:select-right (atom-text-editor.editor.is-focused)
-1:51.5 core:backspace (atom-text-editor.editor.is-focused)
-1:51.0 core:move-right (atom-text-editor.editor.is-focused)
-1:50.6 core:backspace (atom-text-editor.editor.is-focused)
23x -1:50.2 core:move-right (atom-text-editor.editor.is-focused)
2x -1:47.2 core:backspace (atom-text-editor.editor.is-focused)
44x -1:44.7 core:move-right (atom-text-editor.editor.is-focused)
-1:38.9 core:backspace (atom-text-editor.editor.is-focused)
-1:35.9 editor:newline (atom-text-editor.editor.is-focused)
-1:35.2 core:move-down (atom-text-editor.editor.is-focused)
-1:34.8 core:move-right (atom-text-editor.editor.is-focused)
21x -1:34.4 core:select-right (atom-text-editor.editor.is-focused)
-1:22.8 core:paste (atom-text-editor.editor.is-focused)
-1:20.4 core:save (atom-text-editor.editor.is-focused)

Config

{
"core": {
"disabledPackages": [
"emmet",
"autocomplete"
],
"themes": [
"one-dark-ui",
"solarized-dark-syntax"
]
},
"editor": {
"invisibles": {},
"fontSize": 15
}
}

Installed Packages

# User
atom-beautify, v0.21.3
autocomplete-plus, v2.4.0
color-picker, v1.4.4
file-icons, v1.5.0
go-plus, v3.2.3
highlight-line, v0.10.1
linter, v0.12.0
minimap, v4.5.0
project-manager, v1.15.5

# Dev
No dev packages

Issue 2:
[Enter steps to reproduce below:]

...

...

Atom Version: 0.180.0

System: Mac OS X 10.10.2

Thrown From: Atom Core

Stack Trace

Uncaught Error: No line exists for row 18. Last screen row: 17

At /Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:234

Error: No line exists for row 18. Last screen row: 17
at TextEditorPresenter.module.exports.TextEditorPresenter.updateLinesState (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:234:17)
at TextEditorPresenter.module.exports.TextEditorPresenter.characterWidthsChanged (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:835:12)
at TextEditorPresenter.module.exports.TextEditorPresenter.batchCharacterMeasurement (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/src/text-editor-presenter.js:815:21)
at module.exports.React.createClass.measureCharactersInNewLines (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/src/lines-component.js:341:24)
at boundMethod [as measureCharactersInNewLines] (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/node_modules/react-atom-fork/lib/ReactCompositeComponent.js:1295:21)
at module.exports.React.createClass.componentDidUpdate (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/src/lines-component.js:108:14)
at CallbackQueue.mixInto.notifyAll (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/node_modules/react-atom-fork/lib/CallbackQueue.js:75:22)
at ReactReconcileTransaction.ON_DOM_READY_QUEUEING.close (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/node_modules/react-atom-fork/lib/ReactReconcileTransaction.js:88:26)
at ReactReconcileTransaction.Mixin.closeAll (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/node_modules/react-atom-fork/lib/Transaction.js:214:42)
at ReactReconcileTransaction.Mixin.perform (/Users/dan.treasure/Downloads/Atom.app/Contents/Resources/app/node_modules/react-atom-fork/lib/Transaction.js:155:16)

Commands

-0:00.8 window:update-available (atom-workspace.workspace.scrollbars-visible-when-scrolling.theme-atom-dark-syntax.theme-atom-dark-ui)

Config

{
"editor": {
"fontSize": 23
}
}

Installed Packages

# User
atom-jshint, v1.4.3
autocomplete-plus, v0.21.0
linter, v0.4.11
linter-coffeelint, v0.1.1
ruby-slim, v0.2.0

# Dev
No dev packages