Do not underline inline LaTeX, inline code, images

src/protyleHelper.ts

@@ -41,6 +41,28 @@ export class ProtyleHelper {
         return document.querySelector(`div.underline-overlay[for-block-id="${blockID}"]`)
     }
 
+    public static getElementAtTextIndex(root: Element, index: number): Node {
+        let currentOffset = 0;
+        const walker = document.createTreeWalker(root, NodeFilter.SHOW_TEXT, null);
+
+        while (walker.nextNode()) {
+            let node = walker.currentNode
+            const textLength = node.textContent.length;
+
+            if (currentOffset + textLength >= index) {
+                let parent: Element = node.parentElement;
+                while (parent && parent != root) {
+                    node = parent
+                    parent = node.parentElement
+                }
+                return node; // The element containing this text
+            }
+            currentOffset += textLength;
+        }
+
+        return null;
+    }
+
     // given an element such as a span inside a block, return its blockID
     public static getNodeId(el: Element) {
         let i = 0;

src/spellCheckerUI.ts

@@ -49,7 +49,7 @@ export class SpellCheckerUI {
         // Find the text nodes and character positions
         const range = this.createRangeFromCharacterIndices(startIndex, endIndex);
         if (range) {
-            this.createUnderlineFromRange(range, endIndex - startIndex);
+            this.createUnderlineFromRange(range);
         }
     }
 
@@ -101,7 +101,7 @@ export class SpellCheckerUI {
         return null;
     }
 
-    private createUnderlineFromRange(range: Range, charsCount:  number) {
+    private createUnderlineFromRange(range: Range) {
         const rects = range.getClientRects();
         const editorRect = this.block.getBoundingClientRect();
 
@@ -120,19 +120,10 @@ export class SpellCheckerUI {
             underline.style.top = (top + 2 + offset.v) + 'px';
             underline.style.width = width + 'px';
 
-            if(!SpellCheckerUI.checkDontUnderline(width, charsCount)) {
+            this.overlay.appendChild(underline);
-                this.overlay.appendChild(underline);
-            }
         }
     }
 
-    // if the underline is too wide for the number of characters that are underlined, we don't render it
-    // this is a consequence of using .innerText: things like <img> tags are only a character
-    private static checkDontUnderline(width: number, charsCount: number) {
-        const maxWidthPerChar = 16;
-        return width > maxWidthPerChar * charsCount
-    }
-
     private static distance(elA: HTMLElement, elB: HTMLElement): {h: number, v: number} {
         const rectA = elA.getBoundingClientRect();
         const rectB = elB.getBoundingClientRect();

src/suggestions.ts

@@ -20,6 +20,12 @@ export class SuggestionEngine {
     private blockStorage: BlockStorage = {};
     private plugin: SpellCheckPlugin;
 
+    private static blacklisted: string[] = [
+        "span[data-type='inline-math']",
+        "span[data-type='img']",
+        "span[data-type='code']"
+    ];
+
     constructor(plugin: SpellCheckPlugin) {
         this.plugin = plugin
     }
@@ -127,7 +133,8 @@ export class SuggestionEngine {
         thisBlock.spellChecker.clearUnderlines()
 
         thisBlock.suggestions?.forEach(suggestion => {
-            if(!Settings.isInCustomDictionary(this.suggestionToWrongText(suggestion, blockID), this.plugin.settingsUtil)) {
+            if(this.shouldSuggest(blockID, thisBlock, suggestion) &&
+                !Settings.isInCustomDictionary(this.suggestionToWrongText(suggestion, blockID), this.plugin.settingsUtil)) {
                 try {
                     thisBlock.spellChecker.highlightCharacterRange(suggestion.offset, suggestion.offset + suggestion.length)
                 }catch (_) {
@@ -138,6 +145,20 @@ export class SuggestionEngine {
 
     }
 
+    private shouldSuggest(blockID: string, block: StoredBlock, suggestion: Suggestion): boolean {
+
+        const element = block.protyle.fastGetBlockElement(blockID)
+        const eai = ProtyleHelper.getElementAtTextIndex(element, suggestion.offset + suggestion.length)
+
+        for(let blacklisted of SuggestionEngine.blacklisted) {
+            if(eai instanceof Element && eai.matches(blacklisted)) {
+                return false
+            }
+        }
+        return true
+
+    }
+
     public suggestionToWrongText(suggestion: Suggestion, blockID: string): string {
         if(!(blockID in this.blockStorage)) {
             return