Markdown crash repro

[Wavesonics]

This is not meant to be merged, it is a branch based off the head of main right now, which reproduces a crash.

The steps to repro:

1. Set a RichTextEditor value to a long string of markdown
2. Click into the editor
3. Modify the content, either add or delete a character
4. Observe the crash

crash-repro.mp4

Stack Trace:

Exception in thread "AWT-EventQueue-0" java.lang.StringIndexOutOfBoundsException: Range [8487, 8494) out of bounds for length 8487
	at java.base/jdk.internal.util.Preconditions$1.apply(Unknown Source)
	at java.base/jdk.internal.util.Preconditions$1.apply(Unknown Source)
	at java.base/jdk.internal.util.Preconditions$4.apply(Unknown Source)
	at java.base/jdk.internal.util.Preconditions$4.apply(Unknown Source)
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Unknown Source)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckFromToIndex(Unknown Source)
	at java.base/jdk.internal.util.Preconditions.checkFromToIndex(Unknown Source)
	at java.base/java.lang.String.checkBoundsBeginEnd(Unknown Source)
	at java.base/java.lang.String.substring(Unknown Source)
	at com.mohamedrejeb.richeditor.utils.AnnotatedStringExtKt.append-UJKp_GQ(AnnotatedStringExt.kt:119)
	at com.mohamedrejeb.richeditor.utils.AnnotatedStringExtKt.appendRichSpan-XtCa3Zc(AnnotatedStringExt.kt:58)
	at com.mohamedrejeb.richeditor.utils.AnnotatedStringExtKt.appendRichSpan-XtCa3Zc$default(AnnotatedStringExt.kt:43)
	at com.mohamedrejeb.richeditor.utils.AnnotatedStringExtKt.append-UJKp_GQ(AnnotatedStringExt.kt:30)
	at com.mohamedrejeb.richeditor.model.RichTextState.updateAnnotatedString$richeditor_compose(RichTextState.kt:1216)
	at com.mohamedrejeb.richeditor.model.RichTextState.updateTextFieldValue(RichTextState.kt:1163)
	at com.mohamedrejeb.richeditor.model.RichTextState.updateTextFieldValue$default(RichTextState.kt:1147)
	at com.mohamedrejeb.richeditor.model.RichTextState.onTextFieldValueChange$richeditor_compose(RichTextState.kt:1139)
	at com.mohamedrejeb.richeditor.ui.BasicRichTextEditorKt$BasicRichTextEditor$8.invoke$lambda$1$lambda$0(BasicRichTextEditor.kt:242)
	at androidx.compose.foundation.text.BasicTextFieldKt$BasicTextField$11$1.invoke(BasicTextField.kt:771)
	at androidx.compose.foundation.text.BasicTextFieldKt$BasicTextField$11$1.invoke(BasicTextField.kt:769)
	at androidx.compose.foundation.text.LegacyTextFieldState$onValueChange$1.invoke(CoreTextField.kt:1006)
	at androidx.compose.foundation.text.LegacyTextFieldState$onValueChange$1.invoke(CoreTextField.kt:999)
	at androidx.compose.foundation.text.TextFieldKeyInput.apply(TextFieldKeyInput.kt:71)
	at androidx.compose.foundation.text.TextFieldKeyInput.apply(TextFieldKeyInput.kt:75)
	at androidx.compose.foundation.text.TextFieldKeyInput.process-ZmokQxo(TextFieldKeyInput.kt:91)
	at androidx.compose.foundation.text.TextFieldKeyInputKt$textFieldKeyInput$2$1$1.invoke-ZmokQxo(TextFieldKeyInput.kt:261)
	at androidx.compose.foundation.text.TextFieldKeyInputKt$textFieldKeyInput$2$1$1.invoke(TextFieldKeyInput.kt:261)
	at androidx.compose.ui.input.key.KeyInputNode.onKeyEvent-ZmokQxo(KeyInputModifier.kt:80)
	at androidx.compose.ui.focus.FocusOwnerImpl.dispatchKeyEvent-YhN2O0w(FocusOwnerImpl.kt:275)
	at androidx.compose.ui.focus.FocusOwner.dispatchKeyEvent-YhN2O0w$default(FocusOwner.kt:142)
	at androidx.compose.ui.node.RootNodeOwner.onKeyEvent-ZmokQxo(RootNodeOwner.skiko.kt:260)
	at androidx.compose.ui.scene.CanvasLayersComposeSceneImpl.processKeyEvent-ZmokQxo(CanvasLayersComposeScene.skiko.kt:243)
	at androidx.compose.ui.scene.BaseComposeScene$inputHandler$3.invoke-ZmokQxo(BaseComposeScene.skiko.kt:64)
	at androidx.compose.ui.scene.BaseComposeScene$inputHandler$3.invoke(BaseComposeScene.skiko.kt:64)
	at androidx.compose.ui.scene.ComposeSceneInputHandler.onKeyEvent-ZmokQxo(ComposeSceneInputHandler.skiko.kt:129)
	at androidx.compose.ui.scene.BaseComposeScene.sendKeyEvent-ZmokQxo(BaseComposeScene.skiko.kt:245)
	at androidx.compose.ui.scene.ComposeSceneMediator.onKeyEvent(ComposeSceneMediator.desktop.kt:464)
	at androidx.compose.ui.scene.ComposeSceneMediator.access$onKeyEvent(ComposeSceneMediator.desktop.kt:113)
	at androidx.compose.ui.scene.ComposeSceneMediator$keyListener$1.keyTyped(ComposeSceneMediator.desktop.kt:268)
	at java.desktop/java.awt.Component.processKeyEvent(Unknown Source)
	at java.desktop/java.awt.Component.processEvent(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)

[Wavesonics]

I think it has to do with malformed markdown. I tried a lorem ipsum string of similar length going through the setMarkdown method and it didn't crash.

It looks to be related to mismatched code span backticks `? Or maybe just code spans that cross paragraph boundaries? I'm not entirely sure yet.

Another oddity in the markdown parser:

        outlinedRichTextState.setMarkdown(
"""one and two

            wdw""".trimIndent())
    }

The leading four spaces on the 3rd line here cause it to not be parsed into the final content, which I think is a separate bug:
#443

Under four spaces is parsed just fine, but four or more leading spaces and the line is dropped from the output.

[Wavesonics]

Added a test that repros #443

[MohamedRejeb]

Thanks for the repro. The main issue was with having a code span split between two lines, it should be working fine now