fix: using textarea for editor, insert formula when clicking on matht…

[ncornaglia-at-wiris]

…ype icon after reloading website.

Description

This fix implements a fallback for when using textarea as the html element as the parent element of the editor.

• Related Kanbanize Card: Link to KB-X
• Related GitHub Issue: Closes #X (Associated GitHub issue, if any)

Type of Change

Please delete options that are not relevant.

• Feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Chore (non-breaking change that doesn't add any functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to documentation only)
• Refactoring (non-breaking change that improves the code structure)

Checklist

• My code follows the style guidelines of this project ( Run yarn lint to check)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• New and existing unit tests pass locally with my changes

How should be tested? (Manual or Automated Tests)

• Download the broken demo passed by the client on: https://wiris.slack.com/archives/C01HJ7VQW0N/p1761210173114999?name=C01HJ7VQW0N&perma=1761210173114999

• Test that after reloading the page, if the first click is done on mathtype, no formula is inserted.

• On file wiris/index.js paste the modifications from this PR on line 11282:

            // Add null check for latexRange
  
            // This change is needed as when the editor is set in an id of a textarea and not a div, we default to this conditional.
            
            // If this check is not present and we click on the mathtype icon after reloading the page, the equation is not inserted.
            
            if (!latexRange) {
                // Fallback to regular MathML insertion if latexRange is not available
                this.insertMathml(mathml);
                return;
            }
  

• Reload the page and click on mathtype and try to insert.

• Manual tests: I have tested this changes manually.

[Copilot]

Pull Request Overview

This PR fixes an issue where formulas fail to insert when clicking the MathType icon after reloading a page that uses a textarea as the editor's parent element. The fix adds a null check for latexRange and falls back to regular MathML insertion when it's unavailable.

Key Changes:

• Added null check for latexRange in the insertLatex method
• Implemented fallback to insertMathml when latexRange is not available

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[xjiang-at-wiris]

Checked everthing is OK on stagging